housing affordability - Building the Skyline

October 29, 2024 by Jason Barr 2 Comments

The Housing Twenties: New York’s Biggest Building Boom and Its Lessons for Today

Jason M. Barr October 29, 2024

Let’s travel back a century—to New York during the Roaring Twenties.

On our journey, we will see a very different Gotham–not just flappers, speakeasy, and the new jazz–but more importantly massive housing construction. Arguably, 1921 to 1929 was the greatest housing boom in New York’s history. Units of all kinds—high-rises, garden apartments, and one- and two-family homes—were constructed in neighborhoods far and wide. It was a time of housing plenty.

On the other hand, today is a time of housing scarcity, with the housing vacancy rate at a mere 1.4% and with rents constantly rising.

The vital lesson from the Roaring Twenties is that supply matters. When new construction is robust and housing abundant, many benefits follow. First, rents fall. Second, there are more choices, so residents can find the housing size and location that best fits their needs—and they get more space for each rental dollar. Third, new construction upgrades housing quality, allowing households to live in safer, more user-friendly units.^[1]

On the other hand, when housing is scarce, rents rise, and residents are forced to accept units that don’t match their needs. And they find it difficult to move when their life circumstances change because they have fewer options.

Where’s the Beef? Map of Housing Built in 1920s and since 2010. When compared to housing built during the Roaring Twenties, today’s housing is hard to find. Note the 1920s housing is extant housing, thus under-representing the true construction during the period. Source: NYC PLUTO file, 2024.

Housing Supply Then and Now

Let’s view the number of units completed in two respective 24-year periods, 1920-1943 and 2000-2023 (see the graph below). Several things jump out. First, the Roaring Twenties was roaring indeed. From 1920 to 1929, New York built over 740,000 housing units (when New York’s population was one-third less than today!). On the other hand, from 2000 to 2009—during the great housing “boom” of the early 2000s—New York built less than 200,000 units. (Data sources can be found here.)

In the 1920s, Gotham was building housing faster than its population growth. Today, the city barely builds, and population growth is a trickle. In the 1920s, when immigrants arrived, they found affordable housing and raised their children in the city. Today, housing is a game of musical chairs. People move in, bid up the price of scarce units, and others leave as a result. The only reason that New York’s population has grown in the 21^st century is because of improved health—people are living longer; on the hand, net migration has consistently been negative. That is, year after year, more people leave then arrive.

The second fact that jumps out from the graph is that the period from the Great Depression to America’s entry into World War II (1930 to 1941)—arguably the 12 worst years in American economic history—surpassed housing construction in the best 12 years of the 21^st century (2012 to 2023), with 279,134 units during the first period and 239,910 during the second. In short, New York’s 21^st-century booms can’t compete with 20^th-century depressions.

New Housing Units for Two Respective Periods. The Blue Line is from 1920 to 1943. The Orange Line is from 2000 to 2023. Thus 0 is both 1920 or 2000, respectively. Source: See here.

Vacancy

At the end of 1928, apartment rental vacancy was 7.8%, and nearly half the city’s vacant units were in the lowest-income rentals. Due to subway expansion and brisk housing construction, those with lower incomes could improve their housing situations relatively easily. From 1920 to 1929, Brooklyn alone built 250,000 units—more than all five boroughs from 2000 to 2009.

New York’s current low vacancy rate stems from the slowdown in construction due to the COVID pandemic, high interest rates, the rescinding of 421a tax abatements in 2022, and the renewed growth in the city’s economy. But the truth is that housing vacancy has been unhealthy for many decades. The Rent Stabilization Law defines a “housing emergency” when vacancy is less than 5%. By this definition, the city has continually been in a (self-imposed) housing emergency since World War II and has forgotten what a healthy housing market looks like.

But just as important, nearly all the city’s vacant units are at the high end of the spectrum. Vacancy rates for the lowest-income New Yorkers are way below 1%. With this rate, people have few, if any, opportunities to change or improve their housing.

Vacancy Then and Now. The left graph is housing vacancy vs. rent per room for 1928. The right graph is housing vacancy vs rent for 2023. The y-axes are aligned to show how scarce housing is today. The graph below is a larger version of today’s graph. Sources: Left: State Board Housing Report. Right: NYCHVS.

Vacancy Rates in 2023 vs. Asking Rent. Note that vacancy is above 1% only in the highest rent category. In other words, for low- and middle-income housing there is nearly no vacancy. Source: NYCHVS.

In With the New Out with the Old

As a bonus, new housing improves health and safety and creates a better match between what residents want and what’s available—tenants get new features and layouts that reflect their current needs and tastes. New housing is generally safer as it incorporates the most current building codes and health standards.^[2] As the COVID pandemic has shown, many older buildings, with sealed windows and reliance on air conditioning, were not ideally suited for providing air circulation and outdoor space.

During the 1920s, low-income tenements were abandoned in droves. Officials relished the disappearance of the city’s worst housing. In a report written in 1928 by the New York State Board of Housing—not a group known for its support of tenement landlords—wrote:

Perhaps the most gratifying aspect of the improvement in available dwelling space is the increase in the number of vacancies in the old law tenements and the cheapest apartments generally. The prolonged period of prosperity, combined with the increased physical supply of housing, has made it possible to abandon some of the most unsuitable housing….In this connection, the significant fact is not that the poorer classes of the population now have greater freedom of movement and wider choice—for at best the choice of the lower rental offers very little—but rather that the economic position of at least a portion of the poor has been raised sufficiently to enable them to abandon so large a number of wholly inadequate apartments.

Scarce Housing Policy

On the other hand, today’s “scarce housing policy” causes low-income housing to deteriorate. The problem has been made worse by fiat. In 2019, the De Blasio administration enacted a law limiting landlords’ ability to pass along to tenants the cost of upgrades and improvements. As a result, landlords have been incentivized to worsen the housing stock. Tenants are now squeezed on two ends. They have little choice but to remain in their units because of low vacancy rates, and landlords have little choice but to undermaintain their buildings.

The most recent survey of New York’s housing stock shows a general deterioration in low-income housing in the last few years, which is no doubt tied to both the city’s low vacancy and the 2019 law. As the report states,

The 2023 [NYC Housing Vacancy Survey (NYCHVS)] showed a higher prevalence of most individual housing problems relative to earlier cycles, following the same general pattern as in 2021. This was true for housing types, including rent stabilized units and market rentals. The share of units reporting cracks or holes, broken plaster or peeling paint, and toilet breakdowns remained statistically similar to 2021.

Rents and Affordability

Arguably, the best measure of affordability is rent relative to income. Getting exact apples-to-apples data for the two periods is tricky, but we can generate relatively comparable measures. For the 1920s, I have compiled an index that tracks the average wages of industrial workers in New York to average apartment rents. For rents, I used two indexes. The first was created by the Bureau of Labor Statistics (BLS). The second is based on newly created data from four economists, Ronan Lyons, Allison Shertzer, Rowena Gray, and David Agorastos.

The BLS data tracks people who have been renting their units for some time. These people are more likely to experience fewer swings in their rent. During the bad years after WWI, rents rose less slowly (in part due to rent control laws and the fact that landlords were often reluctant to dramatically increase rents on longtime tenants). But during the good years, they reduced rents less quickly due to inertia.

On the other hand, the Lyons et al. index comes from asking rents in classified ads from historical newspapers, which reflect the most current market conditions. Spikes are likely to be greater in lean times, when inventory is scarce, and rent drops faster in flush times when housing is abundant.

Rising Rents is Not a Given

When we compare rent indexes to wages, we see that the 1920s was a period of affordability improvement. In 1914, the index values were at 100; by 1928, both indexes were well below that. Viewing the housing scene from today shows the opposite pattern. Tracking median household incomes to median rents shows that they have consistently risen in the 21^st century. Researchers and policymakers consider housing “affordable” when it can be provided at 30% or less of household income. Since 2000, the median rent-to-income ratio has been consistently above 30%. And rents relative income has dramatically risen to above 50% for the lowest-income New Yorkers. The city’s scarce housing is, in effect, impoverishing a large swath of residents.

An Affordability Index. This graph shows an index of rents relative to average wages for industrial workers in New York from 1914 for 1928. As the building boom of the Roaring Twenties got underway, starting in 1922, affordability improved. The spikes after WWI reflect the economic difficulties driven by the war. Sources: See here.

Median Rents Relative o Median Household Income 1965-2023. Note above 30% is considered housing that is relatively unaffordable. Source: NYCHVS.

What’s the Difference?

Of course, the real estate market in the Roaring Twenties was different from today. First was that the zoning codes were relatively lax. Experts in the mid-20^th century estimated that if the city were built out according to the zoning (and tenement housing) codes enacted in 1916, the city would hold somewhere between 55 and 77 million people!

In 1961, the city was strongly downzoned. By my estimate, the zoning codes today allow for a maximum population of about 12 million people, though this likely overstates the case because 60% of residential properties are either above their maximum allowable floor area limit or within 25% of it. These are properties that are illegal or economically unfeasible to densify.

Second, there was no rent control or rent stabilization law as we know them. There was a form of rent limits implemented in 1920 during the “famine” years following World War I, but they did not inhibit new construction when the timing was right. Today, landlords cannot legally evict tenants in rent-stabilized buildings, and who have no incentive (or ability) to move because there nowhere to go.

Third, the amount of land for development was much greater back then. By 1980 or so, most of the large pockets of residential undeveloped land had been filled in. In the Roaring Twenties, large swaths of land were still open for urban development, and developers were buying up these lots to erect large apartment buildings or entire neighborhoods. While Gotham still has a trove of underutilized land, converting it to more housing is difficult and expensive because of the inability to remove tenants from a building, the fragmented nature of lot ownership, and stringent zoning regulations.

Lessons for Today

The key lesson for today, however, is that when a city builds housing faster than its population particularly in the outer areas, prices drop or flatten, quality improves, and residents have more choices. If a city builds large quantities of middle-income housing, it frees up older units for lower-income residents (through filtering), and they get better housing than otherwise.

Unlike the Roaring Twenties, however, the New York faces the need to redevelop and densify in a built-up city. I have written widely on what the New York can do to fix this problem but let me itemize a few key steps.

Transit Oriented Development

First is to encourage transit-oriented development by the subway lines outside of Manhattan. Upzone these areas for mid-rise buildings. 92% of housing near subway stops outside of Manhattan is three stories or less. If each building was redeveloped by adding double the current stories (and units)—that is, from two to four, or three to six, the affordable housing crisis would be over.

Target Vacancy Rates

Second, city government needs to target neighborhood vacancy rates. One strategy is for the City to buy large, under-utilized lots and sell off the ground leases to developers for new middle-income housing. As the vacancy rates go above 5%, tenants will have more flexibility and choices, and developers will be freer to redevelop their properties to contain more housing.

Reduce Construction Costs

Third, the government also needs to reduce regulations that choke off the building of affordable housing; and it must offer construction subsidies to lower the high construction costs, with proportionally higher subsidies for buildings that will rent to those with moderate and lower incomes.

Plan for Growth

Lastly, the City must plan for growth. As neighborhoods add more residents, the government needs to be ready to invest in better transportation—like streetcar service, dedicated bus lanes, and more subway lines—and to add more schools, services, and parks to preserve the quality of life.

City of Yes?

To his credit, Mayor Eric Adams is promoting re-writing the zoning rules to allow for more housing across the city through his City of Yes Housing Opportunity program. However, even if fully passed by the city council, which seems doubtful, the program would only generate about 7,000 additional units per year–hardly enough to make a dent in the problem.

If New York really wants to make housing affordable it needs a new Roaring Twenties for the 21st century–there’s still time to get started!

—

[1] This is not to deny the charm of older buildings, but the key is for a city to find a better balance between preservation and accommodating the needs of the present.

[2] Having said this, building codes often create an undue burden for those constructing low-income housing. If regulations were reasonably pared back, low-income housing would be cheaper to build.

August 5, 2024 by Jason Barr 1 Comment

The Power Author: Robert Caro, Robert Moses, and the “Fall” of New York

Jason M. Barr August 5, 2024

A few weeks ago, I was walking in Central Park on the Upper West Side. As I strolled past some benches near the Diana Ross Playground, I saw a young man, likely in his late twenties, with his face buried in a huge, white-covered book. When I got closer, I noticed he was reading a brand-new copy of Robert Caro’s 1974, 1,300-page biography, The Power Broker: Robert Moses and the Fall of New York.

It struck me that I was witnessing a quintessentially New York act—to buy the Power Broker and read it in the park. In such an act, we glory in our ability to enjoy ourselves in the vast urban wonderland that is Central Park while reading a book about a man who built more parks in New York than anyone and yet who today is vilified as a power-hungry titan who initiated the fall of Gotham.

The Caro Narrative

It also occurred to me that Robert Caro’s legacy is not just that he provided a chronicle of 20^th-century New York’s most important public figure but has also affected the course of public policy.

Caro’s story is about the abuse of power—how Moses transmogrified into a Kurtz-like figure in The Heart of Darkness. Moses began his career as an ambitious idealist Progressive. His genius and endless drive to create parks and parkways pushed him forward and showed New Yorkers how government can improve people’s lives. Yet, with each success, he became increasingly power-hungry and gamed the system to feed his bottomless appetite.

As Caro writes,

Because of the arrogance that was so basic to his nature…Moses’ susceptibility to the addiction of power was unusually strong….Once Robert Moses had sought power only for the sake of his dreams, only as a means to an end; even then, however, there were signs that he was beginning to seek it for its own sake, as an end in itself. And the avidity with which he sought power—and the lengths to which he went to get it—revealed the depth of his need for it.

After World War II, as Caro’s portrait goes, Moses became deeply entrenched in his “Fortress of Solitude” on Randall’s Island as head of the Triborough Bridge Authority. With a wave of his hand, he clear-cut the “slums” that resulted in massive residential displacements; he ramrodded expressways through vibrant working-class neighborhoods; and his highway construction program drove New Yorkers to become automobile junkies while generating rampant white flight and the collapse of the subways.

Caro provides a gripping tale. We all love a Greek tragedy—the king who becomes so blinded by his power and is convinced of his own perfection that he is unable to see the damage he causes.

Robert Moses in 1939 viewing a model for a Battery Bridge (a tunnel was built instead). Source: Wikipedia.

The Caro Effect

Yet, whereas Moses, the man, was in power until the early 1960s, Caro’s portrait of Moses has been “in power” since 1974. He hovers as a living ghost that haunts New York and holds vast influence, perhaps more so than the flesh-and-blood version ever did.

This is not to say that Moses’s career was not problematic. His policies were not race- or class-neutral and often harmed people of color and the poor to benefit the white middle class. As a master bill writer, he crafted legislation that left him untouched by the democratic process to implement his programs as he saw fit. He swatted away community pushback with the epithet, “You can’t make an omelet without breaking some eggs.”

Bogeyman Moses

However, the overly simplistic residual of Caro’s book—the belief that people cling to—is that because Moses was a power-hungry bully after World War II and presumably harmed New York, we shouldn’t build important megaprojects that the city needs today (megaprojects that other cities worldwide are building easily).

Because Moses brooked no community input, the logic seemingly follows, we must allow full-on community input, and, by extension, local veto power that stops the city from addressing its problems head-on. The defining legacy of Caro’s book is that we have become paralyzed by the fear of Moses’s ghost which Caro conjured to life.

The Harm

New York faces 21^st-century crises that need to be addressed directly and strongly. Most notably, the city must become resilient against climate change, dramatically expand its housing stock, and upgrade and produce other services, including mass transit, to improve quality of life and prevent the high cost of living from pushing people out.

Today, Gotham is tiptoeing its way to climate change resilience. It builds out the shoreline here, adds some bluebelts there, and buys out some households over there. But the truth is that a patchwork of programs only offers partial protection against increasingly damaging storms, flooding, and sea level rise.

New York is on the path toward building $52 billion worth of seawalls that will be used sporadically to stop storm surges. Politically, erecting seawalls away from any residential neighborhood is the easy path, but practically, its cost-benefit ratio is questionable. Billions more will be spent against sea level rise and coastal disappearance.

The Housing Affordability Crisis

Just as important is housing affordability. Over half the city’s renters are rent-burdened, paying more than 30% of their income for housing, and one in three low-income households is severely rent-burdened, paying more than 50% of their income for an apartment. There is hardly any rental housing to be found with the current vacancy rate at a mere 1.4%, the lowest in half a century.

To his credit, Mayor Adams’s City of Yes Housing Opportunity will attempt to add more housing in each neighborhood, but it’s unlikely to have a meaningful impact on affordability. He has to tread gingerly to avoid total rejection of his plan.

Additionally, climate change resilience and housing affordability are not independent. Housing will become scarcer and more expensive as more land is removed from use because of rising sea levels or to mitigate flooding.

The Interchanges to and from the Cross Bronx Expressway ca. 1973. Source: Wikipedia.

Moses: A 20^th-Century Centurion

In the decades following the Power Broker’s publication, there have been more nuanced reevaluations of Moses’s career and impacts. The most forceful and comprehensive is the 2007 book, Robert Moses and the Modern City: The Transformation of New York, edited by Hillary Ballon and Kenneth Jackson (which contains a comprehensive list of Moses’s New York City projects). But the revisionists have been drowned out by the howling of the Caro’s spirit.

Lost in the collective memory is that Moses was a product of his time. He rose out of the Progressive Movement, frustrated with machine politics’ failure to eradicate urban ills like overcrowding and lack of fresh air and sunlight. His genius was in figuring out (for good and for bad) how to overcome nimbyism and status quo politics. He had the support of leaders and the people because he delivered the results that they wanted.

Moses existed within the political spectrum of reformers. On the far left were the socialists who sought to abolish private property. Just to their right were those who wanted to master plan the metropolis, deconcentrate it, and create a network of garden cities. Moses pushed back against those that he saw as being too extreme. He decided that a project-by-project strategy was to be preferred to grand schemes. The populace agreed with him, being suspicious of grand plans that would disrupt the culture of laissez-faire New York.^[1]

Slum Clearance

Moses did not invent slum clearance.^[2] It had been the dream of reformers since after the Civil War with the rise of hyperdense slums in Five Points. In the 1890s, Jacob Riis’s expose, How the Other Half Lives, provided more fuel to the slum clearance movement.

One of the earliest examples of slum clearance was that of Mulberry Bend, a dense cluster of tenements in the Lower East Side that was notorious for its poverty, crime, and vice. It was cleared in 1904 and the land was converted into a park (today Columbus Park).

When Moses was in his heyday, slum clearance advocates were in positions of power through the New Deal programs. After World War II, Title I and public housing funds were made available on a level never seen before in human history.^[3] Moses was able to grab the lion’s share for New York. He was largely supported in his endeavor because he was carrying out the work that previous reformers had been unable to accomplish. Moses was their Trojan Horse.

The Automobile

Moses did not invent America’s love of the automobile, and we can’t blame New Yorker’s car addiction on him (and which is certainly no worse as compared to the rest of the country). It’s good that he didn’t get his way in various projects, such as building elevated highways across Greenwich Village and SoHo, and it’s bad that he did not consider neighborhood impacts when helping to build America’s highway system within Gotham’s borders.

But America’s automobile dependence is based on a much larger institutional and cultural framework—subsidies for cheap oil, various Federal Highway Acts (the National Highway Act of 1956 had the Federal Government covering 90% of localities’ highway construction expenses), and the fact that people highly value the personal freedom that comes with cars.

Moses’s radial highway system for New York City was not his invention. As historian Leonard Wallock states:

Far from being novel, [Moses’s] ideas for a circumferential system of roadways were nearly identical to the ones proposed by the Regional Plan Association in 1929, which in turn were based on Edward H. Bennett’s Brooklyn City Plan (1914) and Daniel Burnham’s Plan of Chicago (1909).

Parts of New York that Will Be Underwater if Sea Levels Rises by Six Feet (a likely projection by 2100). The green areas are those likely to be prone to flooding. Map Source: NOAA.

Moses and “The Fall”

The most influential element of Caro’s book has been its subtitle, “Robert Moses and the Fall of New York,” as if Moses destroyed New York. Yes, Moses did some bad things, and blaming him for Gotham’s post-industrial woes makes for good copy, but it’s just plain wrong.

In fact, after the massive wave of deindustrialization that hit manufacturing cities in the 1960s, New York fared better than most. It lost population from 1970 to 1980 but rebounded after that, and today, the city holds its highest population ever. Detroit and St. Louis, on the other hand, are still losing people. Chicago, Boston, and Newark, for example, have rebounded, but their populations remain far lower than their peak in the 1950s.^[4]

More broadly, while Moses is seen as godlike in his impact on New York, the truth is that there was nothing wholly unique about his building spree. As Wallock writes:

In The Power Broker…Moses is not merely the lawgiver but the creator, for he transcends the role of his Biblical progenitor and usurps the place of God. By making Moses the prime mover responsible for the city’s genesis, [Caro’s] interpretations disregard a crucial fact: from the 1920s through the 1960s, New York’s physical and spatial development was markedly similar to that of other large American cities….The Power Broker fail[s] to explain why other cities, not blessed with a Moses figure, assumed the same physical and spatial configuration as New York.

But Caro was writing in the late 1960s and early 1970s when New York was seemingly coming apart at the seams. To many, including Caro, the “fall” was brought about by Moses’s opening the barn doors. In hindsight, this seems to be a confusion of correlation with causation.

Ironically, in his Introduction, Caro hedges on Moses’s net impact, which is quite rich, given how powerful his book has become. He concludes:

Would New York have been a better place to live if Robert Moses had never built anything? Would it have been a better city if the man who shaped it had never lived? ….

Moses himself, who feels his works will make him immortal, believes he will be justified by history, that his works will endure and be blessed by generations not yet born. Perhaps he is right. It is impossible to say that New York would have been a better city if Robert Moses had never lived.

Time to Move On

It’s time to move on. Let’s put Moses in the past where he belongs. We need to learn the true lessons of Moses and use them as a guide to improve New York’s future, rather than clinging to outdated myths that keep the city nearly paralyzed. The true lessons of Moses are that big projects that will benefit New York can and should be built, but they also need to minimize the negative spillovers and unintended consequences and be done in a way that engenders trust and confidence in the government. Getting community input is vital, but community input should not mean complete veto power.

How to Vanquish Moses’s Ghost

However, once lodged in the public consciousness, myths are hard to kill.^[5] We long for simple explanations for complex phenomena, and when the “truthiness” of the simple explanations is strong, we cling to them. Blaming Moses for the planning mistakes of the 20^th century is easy because he stood in the center of these changes and was seemingly waving his magic wand like Lord Voldemort.

So, how do we remove the Moses Myth from blocking policies needed to keep New York safe, affordable, and viable in the 21^st century? I believe the answer is twofold. One approach must come from the top down and the other from the bottom up.

Trust Building

First is that our leaders need to engender trust. Nimbyism is, in large part, motivated by a failure of confidence that the government will do what’s good for individual residents and that large-scale building projects will do more harm than good. The legacy of Moses and Caro was to remove this trust.

Enabling communities to have strong veto power over large projects forces policymakers to employ half-hearted measures instead. When these measures fail to achieve their purpose, residents blame the government for its inability to solve problems, thereby reinforcing their mistrust.

Leaders need to say, “Yes, people like Moses were heavy-handed and their decisions led to projects that today we feel were poorly implemented, but we must move forward. Some large problems require big solutions, and we can’t tiptoe our way to the future. The cost of inaction is much greater than the cost of action and we have learned from the mistakes of the past and will not repeat them. Here are the ways that we have your back….”

Just as importantly, leaders need to create the institutional mechanisms that will bring residents and communities on board. Community input is vital and should be part of the bargaining process. However, all large-scale policies need to lay out the costs, benefits, and the likely negative spillovers, and directly address how these spillovers will be mitigated to reduce the fear of change. (I have spelled out examples here). One mechanism is that a large project also comes with a compensation fund to which people can apply if directly harmed and which is objectively administered by an impartial board.

Rebranding Moses

While leaders work on the issue of trust and compensation, we, the people, need to rebrand Moses and reframe how he is seen in the public eye.^[6] Yes, Moses did many things that, in hindsight, were regretful. But he also did many wonderful things. What’s wrong with a story about a complicated man who was a product of his time?

We need to change the narrative. We need to get the word out that Old Man Moses died in the 20^th century and we refuse to be afraid of the Spooky Ghost Moses. Let’s put him in the history books along with other 20^th-century figures like Al Smith, Franklin Roosevelt, and Fiorello La Guardia. It’s time to create a future with new leaders who help build New York by incorporating the lessons from the best version of Moses while leaving behind those from his worst side.

—

Notes

[1] When Jane Jacobs emerged on the scene in the early 1960s, her antidote to planning was to eliminate it altogether. Death and Life directly response to the wide-eyed planners who wanted to remake the city from scratch or to build towers in the park. Her “cure” for neighborhoods was to leave them alone (or allow residents to veto any new construction) and permit mixed uses. In terms of city planning, her recipe for utopia was to build more playgrounds and cut long blocks in half to create more sidewalks and street frontages.

[2] Moses did not invent the tower-in-park style of housing either. It was an invention of reformers and visionaries, such as Le Corbusier, starting in the 1920s. The planning consensus during the Great Depression and beyond was that building towers surrounded by green space would cure urban ills.

[3] Arguably federal mortgage programs that created redlining and with which Moses was not involved had a greater effect on cities like New York than Moses’s housing and slum clearance projects.

[4] Ironically, public housing—something in which Moses had a more behind-scenes role in developing—today is a success story in New York. Given the massive affordability problem, NYCHA housing provides a huge benefit for those with low incomes. See Nicholas Dagen Bloom’s book, Public Housing that Worked: New York in the 20^th Century. More broadly, given recent economics research on the impacts of highways (such a Brinkman and Lin, 2024) and slum clearance on cities (such as Collins and Shester, 2013), measuring the net impact of Robert Moses on New York relative to what happened in other cities, would not be too difficult. To my knowledge, no one has specifically measured whether Moses’s projects were a net plus or negative for the city’s economic growth.

[5] Old myths die hard, including the first skyscraper myth, the Manhattan bedrock myth, and the myth of the Skyscraper Curse.

[6] Thanks to Daniel Golliher for his suggestion that it’s time to rebrand Moses.

May 21, 2024 by Jason Barr 1 Comment

Busting Skyscraper Myths

Jason M. Barr May 21, 2024

Note: On May 14, my book Cities in the Sky: The Quest for the World’s Tallest Skyscrapers was published by Scribner Books. This post summarizes some of the myths and misconceptions described in the book. For more information, to buy a copy, or to sign up for my email list, please click here.

Because skyscrapers are so big—and tall—they are shrouded in myth, mystery, and controversy. It’s easy to make up stories about them because there’s often little direct information. Developers are naturally a secretive group, and it’s impossible to know how a building has been engineered since it’s covered in glass and stone. And when we look around, we see tall buildings sprouting up while urban life gets more expensive, so it feels correct to conclude that tall buildings are causing the problem.

However, for nearly twenty years, I have been researching the history and economics of tall buildings. Along the way, I’ve heard many of the stories and claims, and have investigated their veracity as much as possible.

Let’s turn to busting some of the myths, starting with the history first and then moving to the present day.

Myth #1: The Home Insurance Building was the first skyscraper, and William Le Baron Jenney was its inventor

Let’s begin with the concept of the “first skyscraper.” The truth is that it’s impossible to name such a thing. The array of elements required to erect tall buildings evolved in fits and starts over the 19th century. This evolutionary process began with structures with external, load-bearing masonry walls with wood or brick internal framing and “ended” with the fireproofed, wind-braced steel skeleton with an electric elevator.

There was never any one technology in the building process that, when incorporated into a building, was so radical that building forms were inherently different after that.^[1] It’s also important to note that nobody was trying to invent the skyscraper per se. Architects, engineers, developers, contractors, and suppliers were all trying to figure out how to improve building forms to make them more functional and profitable and to accommodate more people. The idea that someone should get credit for inventing the skyscraper emerged after 1890, when tall buildings rose high across American cities, and people were curious to know how these giants came about.

The Home Insurance Building

In 1883, the Home Insurance Company of New York hired the architect William Le Baron Jenney to design a Chicago headquarters. One of Jenney’s engineering strategies was to embed iron columns and beams into the exterior masonry walls to make them thinner to allow for larger windows. Like the countless buildings before him, the Home Insurance Building was an evolutionary step forward.

But a decade later, many architects and engineers claimed they had invented the skyscraper. One was a particularly litigious architect from Minneapolis named Leroy Buffington, who received a patent for iron framing for tall buildings. Starting in 1896, Jenney and his colleagues engaged in a concerted public relations campaign to convince the world that Jenney invented the skyscraper to quash Buffington’s claims. Because the Chicago School architects and engineers were so respected, the world came to believe them, and the notion stuck. Today it is the conventional wisdom that Jenney invented the steel-framed skyscraper. But this idea is a pure myth–a made-up story designed to make a mortal into skyscraper Prometheus. The truth is more mundane: he was clever but hardly radical.

Myth #2: The depth to the bedrock caused skyscrapers to be “missing” in parts of Manhattan

Ask any tour guide or New Yorker interested in Manhattan’s architectural history, and they will tell you that there are no skyscrapers between Downtown and Midtown because the bedrock there was too far down below the surface for developers to anchor their building foundations. Yes, the bedrock north of Downtown is indeed deep below the surface, but it’s wrong that the depths stopped skyscraper construction there. This idea of “missing” skyscrapers was promulgated by a geologist in 1968 because he confused correlation with causation.

The actual reason was demand. At the turn of the 20th century, there was no demand for tall buildings in the tenement and factory districts north of City Hall, precisely where the bedrock was the deepest. If there were, the engineers of the day had the skills and knowledge to make foundations there, but developers didn’t require their services because they couldn’t make money from tall buildings in these neighborhoods. In fact, some of the tallest buildings in the city, like the Woolworth Tower, were built over some of the deepest bedrock spots on Manhattan, so developers and engineers knew what they were doing.

From Left: The Home Insurance Building–Not the First Skyscraper, the Empire State Building, and the Burj Khalifa–Not Boondoggles. Sources: Home, ESB, Burj.

Myth #3: The construction of a record-breaking skyscrapers signals economic doom

In 1999, an economist named Andrew Lawrence invented the phrase “the skyscraper curse,” which claims that the appearance of a record-breaking building heralds that an economic bubble is about to burst and lead to economic calamity. The idea is that record-breakers only get built during times of irrational exuberance, so we can use tall buildings as an exuberance indicator. Lawrence created the so-called Skyscraper Index which “pairs” tall buildings with crises to “prove” his point.

The only problem is that his logic has many problems. First, the “index” is silent on whether we should be looking at the announcement, groundbreaking, topping out, or official opening of a building. In other words, using tall buildings as an indicator of mania is about as fuzzy a measure as one gets, particularly given the long lags between conception and completion.

But just as important, no matter which version of the indicator you use, there is no way to predict when a crisis will emerge from the completion of a tall building. When one drills down into the data, one finds that there is actually no meaningful connection between the two.

Instead, the Skyscraper Curse is an example of what I call Rorschach Economics. Financial and economic crises have happened twice the frequency compared to the construction of a record-breaking building, so it’s easy to pair a building with a nearby crisis and falsely conclude there is a connection. (It also turns out there’s an “eerie” connection between record-breaking buildings and maritime disasters.)

Myth #4: Record-breakers don’t pay

When the Empire State Building was completed in 1931, its upper half went unrented because of the Great Depression. The building earned the moniker the “Empty State Building,” which led to the myth that record-breaking structures are simply monuments to the ego-driven developer who wants to claim the prize of the “tallest building,” and the economics be damned.

However, to blame the developers for failing to see the arrival of the Great Depression is moving the goalpost. The Great Depression was utterly unforecastable, and its length and severity could never have been foreseen by any developer, no matter how rational. It’s akin to telling a developer in the fall of 2019 to hold off on a new project because a horrible pandemic is coming next spring. No one saw either one coming.

More broadly, the idea that record-breakers don’t pay is a myth. Part of it stems from the true notion that as buildings get taller, they get more expensive to build on a per-floor or per-square-foot basis. For example, more elevators and longer cables are needed, and more steel and concrete are required for wind bracing and foundations. So, people look at the additional costs and assume they are making these projects inefficient.

Costs and Benefits

But you can’t ignore the revenue side. To understand if a project is rational or profitable, you need to look at the net income of buildings over time relative to the cost of constructing them. And when you do this, you see that record breakers make much more economic sense than people think. Even the Empire State Building, which got off to a rocky start, has been consistently profitable for most of its 90-year history.

Today, record breakers are built with more than just economics in mind. They are built to boost tourism, increase property values in their neighborhoods, and put a city on the map. And they generally make money from rents. When we expand the definition of the benefits, we see they are rational projects indeed.

Bedrock Depths in Manhattan Going from the Southern Tip to Midtown. Triangles are tall buildings, circles are low-rise buildings. Notice that some skyscrapers are built over very deep bedrock. Source: Barr, Tassier, and Trendafilov (2011).

Myth #5: Developers are engaging in rampant “vanity height” competition

In 1998, when the Petronas Towers were completed and declared “the world’s tallest buildings,” people cried foul. The reason was that it would only be a record-breaker because of the 151-foot-tall (x m) spire. The top floor at 1,230 feet (375 m) was still 124 feet (38 m) below the tallest floor of the Sears (Willis) Tower, completed in 1974.

Until 1998, there were no official measurements, and the Council on Tall Buildings and Urban Habitat (CTBUH) stepped into this role. As an organization comprised mainly of architects and engineers, they were well-equipped to measure building heights. They determined that if a building had a spire that is architecturally part of the structure, it counts toward the overall height of the building.

Since then, extruding spires have become a way to raise a building’s “neck” even higher. The next record breaker after the Petronas Towers, Taipei 101, has a spire that is 230 feet (70 m), and the Burj Khalifa’s spire is a whopping 801 feet (244 m).

The Vanity Height Myth

The use of spires to help extrude record-breakers has led to what I call the Vanity Height Myth: that spires are getting taller and are the only way to break a record. However, except for the spires on Petronas Towers, the floor heights of the record breakers are all taller than previous record holders. Just as importantly, spires are essential to the structure’s architecture.

No one complains about the spires on the Empire State or Chrysler Buildings—we celebrate them. Yes, there are some examples of what seems like “let’s put a spire on our building to make it taller”—One World Trade Center comes to mind—but for the most part, spires either add to the elegance of the building or are not needed to be a record breaker. For that matter, the Twin Towers and Sears (Willis) had no spires.

More broadly, I investigated the differences between the architectural height and the top floor height for a sample of nearly 2,000 buildings of 100 meters or taller buildings completed worldwide. My finding is that, on average, the difference represents only 10% of the total structure’s height. For supertall skyscrapers of 300 meters (984 feet) or taller, that average is still relatively low at 12% (median of 9.7%). In short, across the spectrum, vanity height is actually a very small—or short—part of tall building design.

Myth #6: Tall buildings are only for the rich

In global cities like New York and London, the skyscrapers erected in central areas tend to be apartments for the rich or global headquarters for international firms. This phenomenon has led to the idea that tall buildings are only for the wealthy. Yes, tall buildings are more expensive than shorter ones, but nothing is inherent in the structure’s economics that makes them only for the wealthy.

Spend five minutes in any Chinese city to see this. Tall buildings are built for nearly everyone—the homes of the middle class in cities large, medium, and small. Unlike in America, where free-standing, single-family homes are the norm, high-rise apartments are typical in China. The country has been building them in spades, so much so that China is in the midst of a housing crisis, with nationwide vacancy at 15%.

More broadly, when it comes to costs, there is a u-shaped relationship between height and per-square-foot or -meter costs, but the floor count where the lowest point is hit depends on many factors. One study of high-rise housing costs in Hong Kong found that the minimum per square meter cost was 100 meters (about 30 floors or 328 feet), on average. Overall, if planned properly on a large lot, built by an efficient construction sector, and with few stringent building regulations, tall buildings can be built as cost-effectively as low-rise ones.

It’s also worth remembering that American high-rise public housing was a failed policy not because of construction costs. They were built quite cheaply. The problems, in brief, were public policies that hyper-concentrated poverty while housing authorities under-maintained the buildings.

Middle-class High-rising Housing in China. Clockwise from top left: Shenzhen, Changchun, Shanghai, Hong Kong. Photos by Jason Barr.

Myth #7: Skyscrapers make cities more unaffordable

Global cities like New York and London are very expensive places in which to live. Most people blame the high-rises. The logic goes that high-rises are costly to build and only for the rich. So, the rich move in, displace the poor and make housing less affordable for everyone.

But this notion confuses causation with correlation. Simply put, big cities are not building enough housing for everyone. New York City has a citywide housing vacancy rate of 1.4%! In London, that vacancy rate is 1.7%. There is no extra housing for anyone.

But it’s easy to focus on tall buildings because they are most likely to be noticed when we observe new construction in the city. In truth, more tall buildings are likely being built than new low-rise buildings because cities, by design, keep most of them closed for new construction and only allow tall buildings in the center, where it’s the least politically costly to do so.

Positive Spillovers

However, tall buildings do have beneficial impacts on the prices of nearby buildings. Two studies, for example, one in America and one in Helsinki, followed people who moved into new centrally located high-rise buildings. They found that the majority originated from their respective metro regions. Then, they tracked those who moved into their “abandoned units” and found that they had, on average, lower incomes. So, in short, building high-rise housing in the center frees up lower-cost housing for those within lower income brackets. Another group of cutting-edge studies has shown that adding new housing supply lowers nearby housing prices. Additionally, a cluster of studies show that reducing zoning stringency leads to more construction and lower housing prices.

But why don’t we see it? The reason is that supply increases are swamped by rising demand and income. Believe me, if citywide housing vacancies—including in the lowest-income neighborhoods—were, say, between 7% and 10%, no one would blame high-rises; instead, they would be saying that they are solving the housing crisis.

Change in Housing Units in New York City by Block, 2003-2020. Note that the majority of blocks in New York saw virtually no growth their housing stock. Housing growth only appears in select neighborhoods. This is why housing is unaffordable in New York City. Source: NYC PLUTO file.

Myth #8: Five- to ten-story buildings are the ideal for cities

Tall buildings get a bad rap for all sorts of reasons. They tend to emit more greenhouse gases, and people feel they are alienating and inherently harmful for aesthetically pleasing cities while only being palaces for the rich. On the other hand, urban advocates look at the sprawling suburbs and see excessive car dependence and expensive single-family homes.

Urbanists thus point to Greenwich Village with its five-story walk-ups and Second Empire Paris with its seven– to ten-story mansard-roofed buildings as ideal for creating the “human scale.” These urban areas have given rise to the perception that they have the “perfect” density. They have lower carbon footprints, a high enough density to sustain mixed uses and promote pedestrian-friendly neighborhoods.

It must, therefore follow, the logic goes, that to create the perfect Jane-Jacobs-approved city, we must require all cities to have five- to ten-story apartment buildings everywhere. I love Paris and Greenwich Village as much as the next person, but the only problem with this logic is that imposing height caps or trying to mandate “Goldilocks Density” does more harm than good. By ignoring the economics of land use and people’s wishes, height caps and building type requirements generate a bevy of unintended consequences, including higher housing prices, more carbon emissions, sprawl, and lower employment growth.

In the Center

Skyscrapers rise in the center because more people want to be at these locations than can be accommodated by a low-rise building. In this case, the only way to accommodate this demand is to go up. Farther away, where commuting to the center takes longer, people should have access to low-rise neighborhoods with more space per household. The cost and benefits of being in different locations must drive the housing types.

Policies need to consider this fundamental trade-off: smaller housing units and taller buildings in valuable locations and larger units in low-rise buildings further away. If a city perverts this trade-off, it makes people worse off. A one-size-fits-all policy harms cities and their ability to successfully attract people and provide employment opportunities. The natural way to densify neighborhoods is to provide efficient public transportation, parks, access to retail, and good schools and let the supply match the demand.

Truth #1: We need to think more deeply about cities

The conclusions about tall buildings that people make often arise from the confusion of correlation with causation or by generalizing based on one or a handful of observations. We need to discover the truth by looking deeply at the data, inquiring into how people respond to incentives, and uncovering the logic of social systems. Please join me in this endeavor!

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^[1] If one technology made the biggest difference, it was the elevator, which radically changed the economics of going tall since now occupants would rent the higher floors for more money than the lower ones.

January 29, 2024 by Jason Barr 3 Comments

The Plot Thickens (Part II): Sticky Gotham

Jason M. Barr January 29, 2024

[Coming May 14, 2024: Cities in the Sky: The Quest for the the World’s Tallest Skyscrapers (Scribner Books)]

What’s driving the affordability problem in New York City? If you ask a random person on the street, they’ll blame developers, who seemingly only build luxury towers for the well-to-do. But the developer might say that the land values are to blame—to recoup the high cost of the land and expensive construction costs, the only profitable new development is on the high end.

As discussed in the previous post, expensive land values are a symptom—not the cause—of a larger problem—the lack of land being offered up for redevelopment. The high land values signal New York’s “scarce land policy.” The lack of in-fill and densification is due to a series of government-made and natural frictions. Here we dive into more details about the nature of these frictions and the policies needed to “loosen” things up.

Gummed-up Gotham

First, let’s review the facts on the ground. If we look at block-level changes in the number of housing units in the last two decades, we see a very sticky Gotham. Nearly one out of three (31%) blocks with at least one housing unit in 2004 had no change in the number of units since then. 57% of blocks had zero, plus or minus one unit. More broadly, nearly half (48%) of the city’s blocks had no change or lost units. No matter how you slice and dice it, about half of the city’s residential blocks remained frozen in the last two decades.^[1]

Taking a helicopter view of New York’s 59 community districts, nearly two-thirds grew their housing by less than 10%, while only four had a two-decade growth rate of 30% or more (see figure below). In short, only four community districts did any real heavy lifting, and one was lower Manhattan, where Art Deco office towers were converted to apartments.

Block-level Changes in Housing Units. The majority of New York City Blocks either lost or had no change in units between 2004 and 2022. Note blocks shown are ones that had at least one unit of housing in 2004. Source NYC PLUTO file.

Should I Stay or Should I Grow?

New York City has about 859,000 land parcels (and the number has been steady over the last few years). One metric of what’s offered for development is to count the number of new building permits for housing.

In the last five years, the average number of permits issued is about 1,500 per year, and the city has completed, on average, about 25,000 per year or about 250,000 gross new housing units per decade—without accounting for teardowns, unit mergers, or conversions to other uses. 2023 was a terrible year, with less than 10,000 units permitted. A back-of-the-envelope calculation suggests that the probability that any lot “gives itself up” for redevelopment is about 1,500/859,000 = 0.17%.

One year ago, Mayor Adams proposed adding 500,000 units in the next decade which would represent a nearly 250% increase in the number of units built each year and more than double the number of permits issued. But we can’t get to abundant housing if the land is iced.

Give Yourself Up

The aim of this post is to estimate the probability or likelihood that a block generated at least one new unit of housing over the five years from 2018 to 2022 based on the block-level characteristics that existed as of 2016.^[2] In short, the exercises aim to look at what features of New York’s lots and blocks are incentivizing or disincentivizing new construction. (The data sources and processing are here.)

This statistical exercise does not consider things like tax abatement generosity or broader macroeconomic issues like rent values. Rather, the analysis considers what is about the lots and blocks themselves and the buildings on the lots that would suggest why a lot is given up. If we genuinely want to make housing more affordable, we need to know what’s going on and focus on “loosening” the lots.

Probably?

The data reveal that the probability of a city block producing at least one unit of new housing (given it had at least one unit previously) during the period was about 13% or about 2.6% per year. These blocks produced about 48,000 new units or about 9,600 per year (which also suggests that about half of all new housing built today is on formerly commercial, industrial, or vacant land).

So, let’s say, for example, to get to more abundant housing, we want to double the probability that a block produces at least one unit of new housing. What would it take? In other words, how do we go from a five-year probability of 13% to, say, 25%?

Drivers of the Gap

As discussed in the prior post, the underlying economics of cities and land use suggest several factors that drive the likelihood that a lot will have redevelopment. I defined the “Development Gap” as the potential profits obtained from densifying a lot versus the profits from keeping the lot as it is. The higher the Gap, the more likely a lot will gain more units. What are those elements?

Centrality

The first is centrality. Since housing prices are higher in the center because of the greater demand to reside there, the Gap will be higher in more central locations (here, I define the city center as the Empire State Building).

Zoning

Next is zoning regulations—the more stringent the regulations, the lower the Gap because the redevelopment floor area is capped to something that would not produce an income above the cost. In New York, building density is regulated by caps on the Floor Area Ratio (FAR), which limits total floor space per square foot of lot area. In many instances, a current building’s floor area is greater than the allowable maximum for a new structure, making redevelopment virtually impossible.

Current Building Density

The greater an existing building’s density and height, the less likely the lot will be redeveloped because of the difficulties associated with emptying and tearing it down.

Rent Stabilization

Rent stabilization is a mixed bag in terms of incentivizing redevelopment. On the one hand, it lowers the actual income relative to the market-rate potential. On the other hand, it’s hard to redevelop when it’s difficult to get tenants to move. So, the net effect is unclear a priori.

Ownership Status

Turning to owner-occupied units, we expect those to be much less likely to be redeveloped. In the case of condos or coops, all the tenants would have to agree to such an idea—nearly an impossibility. In the one- or two-family-home case, homeowners are less likely to move, given the costs of selling their house and buying a new one. Additionally, homeownership is highly subsidized to encourage long-term tenancy. So, homeowners, by their very nature, are households that are less likely to move.

Landmarking and Historical Districts

Landmarking and historical districts reduce redevelopment because they make it illegal to make large-scale changes to the affected properties.^[3]

Call Me Maybe: The Evidence

Policy Created Frictions

Turning to the statistical (regression) results (here), I find that the “Development Gap Theory” is strongly supported. Scarce housing in New York is not a mystery: Economics matters and the way to get more supply is to understand the factors that disincentivize new housing—across the entire city.

Regarding policy decisions, zoning strong impacts redevelopment. For example, the analysis reveals that doubling the allowable FAR on a block (e.g., from 1 to 2 or 2 to 4) increases the probability of redevelopment in five years by about ten percentage points. Relatedly, the more lots on a block above the allowable FAR, the lower the probability of redevelopment, as expected. Each additional ten buildings over the allowable limit reduced the likelihood of redevelopment by about 1.5 percentage points.

As expected, the statistical analysis shows that the more buildings that are landmarked or fall within historic districts, the less likely a block will have new residential buildings five years later, similarly for blocks with many owner-occupied units.

Interestingly, a block with more rent-stabilized buildings does not affect the probability that a block will create at least one unit. This likely reflects how rent stabilization impacts the Gap, as discussed above.^[4]

Natural or Structural Frictions

But policy decisions about land use are not the only game in town. As cities age, they create their own “natural” or “structural” frictions. In principle, the city’s grid can determine the shape of the blocks and the number of parcels on each one. Over time, ownership can become more dispersed, making combining lots harder. Before zoning, many blocks had buildings with much greater densities. Plus, location matters—places where prices are lower are less likely to redevelop simply because of the economics.

The statistical results here strongly suggest that these historical factors matter. Buildings further away from the center, on average, are less likely to add new housing simply because of the lower revenues these properties will generate. If two blocks are similar, but one has twice the building floor area, its redevelopment probably drops by four percentage points.

Interestingly, larger blocks are less likely to have redevelopment activity, while blocks with more lots will likely see more redevelopment. The reason for these findings needs to be explored further, but having more lots on a given block means more decision-makers, and thus, it is more likely that some of them will redevelop their properties. Lot size matters, too. If a block has too many very small lots, it’s less likely to see redevelopment.

Housing Stock Growth By Community Districts (2004-2022). About two-thirds of Community Districts added less than 10% to their housing stock in two decades. Source NYC PLUTO file

Playing the Odds: Getting to Abundant Housing

Given the findings, what might the City do to double the probability of getting double the housing?

Upzoning

Let’s start with zoning. The evidence worldwide shows that upzoning works, and the data analysis here also supports that. I found that stringent zoning strongly reduces the probability that a block will build new housing.

Say the city doubles the allowable floor area ratio (FAR) on each block and that none of the buildings are above the allowable floor area. This change would increase the five-year citywide probability of redevelopment by an additional ten percentage points. So, doubling zoning gets you about three-quarters the way there.

Taxing and Subsidies

Construction subsidies or tax abatements can help loosen up the lots, but they need to be more targeted to “stickier” areas. They should be based on the distance from the center or the neighborhood’s income level. Lower-income neighborhoods should get more generous subsidies, as should those further away from the center. For single-family districts, the city should give tax abatements for ADUs or converting single-family housing into two-family housing.

New York City has over 565,000 one- and two-family homes. As a thought experiment, if each added one more unit—an Accessory Dwelling Unit (ADU) or new internal unit via subdivision—the city could get to Mayor Adam’s target of 500,000 new units without a single teardown.

More broadly, a land value tax that taxes land values higher than the value of the building is a good way to disincentivize the holding of under-developed plots.

Land Banking

The City can’t do much about block sizes and current building densities. However, it can impact zoning regulations and encourage land assembly or land banking. The City would buy up underutilized lots and then sell them to other property holders on the block creating larger lots that would be more profitable to redevelop.

A City of Yes?

Mayor Adams likes to use the phrase “City of Yes” to pitch his plans for new housing, but today Gotham remains the “City of No.” The road to abundant housing is clear:

Relax stringent zoning rules (especially near transit lines),
Subsidize housing construction costs in lower-income housing neighborhoods and those in “low Gap” neighborhoods.
Allow one- and two-family homes to add one or two more units.
Create a land value tax.
Establish a City authority that buys land to encourage land assembly or sells ground leases for affordable development.

Despite widespread supply skepticism, the results in this post show that the problem of affordable housing is not one of economics—it’s one of politics. Releasing the land will get us there if the political will emerges to allow it. It’s time to unstuck Gotham.

Continue reading Part I of the series here.

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^[1]These statistics are based on lots that had some housing units in 2004. Thus, we are not talking about the conversion of industrial or commercial land to residential.

^[2] I repeated the exercise to see what prompts a block to build ten or more units of new housing. Results are broadly similar. See here for the results.

^[3] I want to be clear, I’m not opposed to landmarking and the creation of historic districts. However, it’s important to recognize that they reduce a city’s ability to provide more housing supply.

^[4] However, the more rent-stabilized buildings on a lot, the more likely it will be redeveloped for ten units or more. So, it suggests that rent stabilization is promoting redevelopment in denser, more central places where the Gap is stronger.