São Paulo Transit-Oriented Zoning Reform Increased Housing Supply and Cut Prices, Study Finds

New research on São Paulo’s zoning overhaul shows that allowing dense housing production along the city’s transit corridors substantially increased housing supply and lowered prices, while producing overall welfare gains for the metropolitan area. The study, which focuses on the effects of the reform after its implementation, finds that the change generated clear winners among future homeowners and developers and clear losers among landlords and people who already owned homes in upgraded neighborhoods. The results are being closely watched by urban economists because zoning liberalization is often a controversial policy: many residents fear it will cause displacement, while developers and housing advocates insist it will ease shortages. This paper shows that both things can be true at the same time.

Background: a city constrained by its own rules

São Paulo, with more than 12 million residents in the city and roughly 21 million in the metropolitan area, is one of the most expensive and unequal housing markets in Latin America. For decades, the city’s planning framework placed tight caps on the amount of floor area that could be built on any given plot. Those caps were especially restrictive in central districts served by well-developed public transport, even as demand to live near transit grew. Real estate developers therefore concentrated on high-end projects for the top of the income distribution or moved to the urban periphery, where land was cheaper and rules were more permissive. Low- and middle-income workers were left with long commutes, crowded neighborhoods, and heavy transport costs. The housing deficit in the municipality had grown to the hundreds of thousands of dwellings, and rents consumed large shares of household income.

The recognition that the city’s regulatory framework was itself a bottleneck gradually won over municipal officials, urban planners, and business groups. After a long public consultation and several attempts, the city government enacted a major reform of its zoning law. The reform was designed around a simple idea: if the city already has expensive rail, bus, and subway infrastructure, land near those stations should be used more intensively. Restricting development in those areas, the reasoning went, meant squandering scarce public investment and pushing growth to places with poor services and high environmental costs.

What the reform changed

Under the new rules, developers could build substantially more residential floor area within a designated radius of transit stations and on major transport corridors. The reform raised allowable building heights and cut the amount of land required per housing unit in these zones. It also encouraged mixed-use buildings, with ground-floor shops and residential apartments above. Crucially, the rules did not rely on large government subsidies or a new public housing effort. Instead, they changed the economic incentive for private construction companies. Land that had been, in effect, hidden by zoning rules became available for dense housing. The right to build on it translated into a valuable asset, but only if developers actually constructed and sold apartments.

Because the reform applied to specific geographic zones with clear boundaries, it created a kind of natural experiment. Researchers could compare changes in housing outcomes in areas inside the eligible transit corridors with similar areas just outside them. The comparisons helped separate the effect of the zoning reform from the broader economic cycle in São Paulo. Using property transaction records, rental listings, construction permits, and building completion data, the study tracked what happened after the reform went into force.

More supply, lower prices

The central result is that the reform worked in the intended direction. New residential permits rose sharply in the eligible zones, and developers started construction on many more apartment buildings than they had in the years before the reform. The completed units were not all luxury homes; a significant share of the new development was aimed at the middle of the market, especially studio and one- or two-bedroom apartments. This increase in available housing was large enough to affect prices. In the treated areas, the typical sale price and rent pulled away from the upward trend in comparable neighborhoods outside the reform zones. In some corridors, prices fell outright after several years of new supply.

The basic mechanism was supply and demand. When many new homes open in a defined area, it becomes easier for buyers and renters to find a place, and landlords and sellers must compete more aggressively. In a city with a large housing deficit, the new units absorbed some of the excess demand that would otherwise have pushed prices up. The study notes that the effect did not simply shift demand from one neighborhood to another; the overall stock of homes in well-located areas expanded, and the city as a whole saw a welfare gain.

How the gains and losses were distributed

The welfare analysis is one of the most important parts of the study. The authors calculate that the reform produced a net positive gain for the city, meaning the value of the benefits to people who gained exceeded the value of the losses to those who lost. On one side of the ledger were prospective homeowners and renters who paid less for housing in the upgraded corridors. They gained not only in financial terms but also in terms of access to jobs, schools, and services. Developers also gained because the reform expanded the amount of profitable development rights and allowed them to build more units on sites they already owned.

On the other side were landlords and incumbent homeowners. Landlords saw their properties face steeper competition from new buildings, which put downward pressure on the rents they could charge. Homeowners who did not sell their units may have seen property values grow more slowly than they would have without the new supply. For many existing residents, any gain from a more convenient, denser neighborhood could be outweighed by the sense that their surroundings had changed and that their largest financial asset no longer appreciated as quickly as before. This distributional split helps explain why upzoning can be politically explosive. The people harmed by new supply are often well-organized and locally powerful, while the people who benefit, especially future residents, do not yet have a voice in local elections.

Broader policy lessons

The São Paulo case offers several lessons for other cities. First, supply-side policies are most effective when housing demand is strong. In a weak market, allowing more construction may have little effect because developers will not choose to build. In São Paulo, the combination of economic recovery and pent-up urban demand meant that new permissions quickly turned into new buildings. Second, the location of the reform mattered. By concentrating density near existing transit, the city avoided the need for expensive new infrastructure and made the new housing more valuable to households. Third, the reform shows that zoning changes can move the affordability needle, but they are not a complete housing policy.

Urban planners and housing researchers argue that zoning liberalization should be paired with other tools: inclusionary zoning, social housing requirements, tenant protections, and investments in local schools, parks, and health services. Without those complements, the benefits of density may flow disproportionately to investors and higher-income households, while lower-income residents risk displacement. The São Paulo study does not claim that the reform solved the housing crisis. Instead, it demonstrates a realistic outcome: a well-targeted regulatory change can make a measurable difference, even while leaving deeper structural inequalities in place.

What comes next

The findings are likely to influence housing debates in other Brazilian cities and across Latin America. Many municipalities are reviewing their master plans and zoning codes, and international institutions increasingly recommend transit-oriented development as a way to reduce emissions and improve urban efficiency. São Paulo’s experience gives those efforts a concrete evidence base. It also suggests that the politics of zoning are not inevitable: with careful design, governments can expand housing supply in locations that make the city work more efficiently, while managing the costs for existing residents.

The next phase for São Paulo will be to monitor the long-term effects of the reform. Questions remain about displacement, gentrification, and whether the new supply will remain affordable. The study’s authors warn that a single zoning change is not enough to guarantee inclusive growth. But their results make a strong empirical case that adding homes where people want to live is a crucial part of the answer.