Ninety-nine apartments on the lot, ninety-nine apartments in the plans, and rarely a 100th. Across New York City, real estate developers are registering new residential buildings for a crucial state property tax break at precisely 99 units, a statistical anomaly that housing analysts and labor advocates say is a deliberate design to avoid tripping higher wage and affordability mandates.

The phenomenon centers on the state’s 485-x property tax exemption program, which was enacted by the New York State Legislature on April 20, 2024, in the state budget, arriving nearly two years after its predecessor, the expired 421-a program. Designed as a cornerstone for housing development, 485-x exempts developers of new rental housing from property taxes in exchange for a commitment to include income-restricted affordable apartments. However, data compiled by Latent Urban Ventures, a New York-based real estate and technology firm, reveals a stark clustering of projects hitting a ceiling just below the 100-unit threshold.

City registrations released on October 14 for the 485-x program added 20 projects featuring exactly 99 units. Notably absent from the registry were any projects containing between 100 and 104 units, according to Latent Urban. In fact, the batch included only a single project registered at 100 or more units. Looking broader across both the April and October registration releases, a total of 49 registered projects share the exact same count of 99 apartments.

This concentration is not merely a byproduct of the registration process; it appears well before developers formally enter the program. Department of Buildings records analyzed by Latent Urban up to September 20 revealed 112 unregistered projects designed with exactly 99 units, compared to just one project sitting at 100 units.

The pipeline further illustrates the stark divide. Latent Urban identified 148 unregistered projects comprising 100 or more units, with approximately 80 of them appearing to have already commenced construction. After reviewing 74 of those larger projects, the firm ruled out 62 for utilizing alternative housing programs, operating as condominiums, or existing outside the rental pipeline. Of those 62 excluded projects, 61 were conspicuously absent from the latest city registration release.

Speed to registration also highlights the preference for the 99-unit threshold. Among projects that broke ground between April 1 and September 20, 63 percent of those featuring 99 units had officially registered by September 24—accounting for 17 out of 27 projects. By contrast, only one out of 24 projects featuring 100 or more units had completed registration, though some of those larger developments remain within their standard six-month registration window.

Critics Call the 99-Unit Cap a Loophole

The debate over the design of the 485-x program touches on broader political goals for the city’s housing landscape. Mayor Zohran Mamdani secured office on a platform promising to make New York more affordable and aggressively expand the housing supply, with a housing plan targeting the construction of 200,000 new affordable homes over a decade.

The 485-x program is intended to serve as one of the primary legislative engines for that ambition. Yet, the statutory thresholds built into the program have created powerful incentives for developers to scale back project sizes. Under program guidelines, once a development reaches 100 units, the required share of affordable apartments jumps from 20 percent to 25 percent. Furthermore, construction workers employed on projects crossing the 100-unit mark must be paid a prevailing wage floor of at least $40 an hour, which is structured to increase by 2.5 percent annually in designated zones throughout the city.

Faced with these escalating compliance costs, developers have increasingly turned to subdivision strategies, clustering multiple projects into distinct 99-unit buildings—even when those structures are physically attached or share a single lot.

A comprehensive Gothamist analysis uncovered 48 clusters of adjacent buildings containing 99 or fewer units between April 2024 and April 2026. According to the analysis, developers utilizing these clustered configurations created 538 fewer affordable units than would have been legally mandated if they had built unified, larger structures—representing a 21 percent shortfall in affordable housing production.

A clear example of this strategy unfolded in East Harlem, where Clipper Equity filed paperwork to divide a single large development lot into seven separate 99-unit buildings. Under the requirements of the tax program, that architectural maneuver resulted in 35 fewer affordable apartments than a single, consolidated 700-unit building would have required.

Labor unions have sharply criticized the trend, labeling the 99-unit cap a glaring loophole that undermines the public interest. Gary LaBarbera, president of the Building and Construction Trades Council, did not mince words regarding the practice, telling Gothamist that developers employing the tactic are "ripping off the taxpayers."

On the other side of the issue, real estate developers have consistently defended their sizing decisions, arguing that the steep wage mandates and higher affordability quotas attached to projects of 100 units or more make larger developments financially unworkable in the current economic climate.

What to Watch

As the real estate market continues to adapt to the 485-x framework, housing analysts are monitoring a fresh batch of developments to see if the pattern persists. Six larger projects initiated construction during late June and July, with their official program registration deadlines stretching as late as February 19, 2027. Future releases from the city will provide a clearer indication of whether these larger developments ultimately enter the tax exemption program or stall out.

At the same time, industry experts urge caution when interpreting the raw registration data. Latent Urban noted that the figures alone cannot fully isolate the specific effects of the 485-x program from broader macroeconomic pressures, such as fluctuating interest rates, volatile construction costs, and shifting rental markets. Additionally, the available data does not reveal the maximum number of apartments that the 99-unit sites could have physically accommodated.

For the moment, the Mamdani administration has maintained that it is not actively advocating for legislative alterations to the 485-x program. State lawmakers in Albany have similarly refrained from signaling any immediate plans to revisit or amend the statutory thresholds governing the tax break.