The Program Behind Almost Every New Rental Building

When 421-a stopped taking new projects in June 2022, ground-up rental construction in New York effectively stalled — the property tax math rarely works without an exemption given local construction costs. 485-x, officially "Affordable Neighborhoods for New Yorkers," replaced it in 2024. If a developer is offering on your site to build rental housing, 485-x is very likely the reason their numbers work at all.

Five Tracks — Why the Size of the Project Matters to Your Price

485-x isn't a single deal — it's five, sorted by project size, each with a different affordability requirement and benefit length:

  • Very Large Rental (150+ units, designated zones): 25% affordable at ≤60% AMI weighted average, up to 40 years at full exemption
  • Large Rental (100+ units, citywide): 25% affordable at ≤80% AMI, 35 years at full exemption
  • Modest Rental (6–99 units, citywide): 20% affordable at ≤80% AMI, 25 years full plus 10 years at the affordability percentage
  • Small Rental (6–10 units, outside Manhattan): rent-stabilization-based instead of AMI-based, 10 years full exemption
  • Homeownership (6+ units, condo/co-op, outside Manhattan): assessed-value based, 20 years full exemption

This matters to you as a seller because a site's size potential — how many units it can support — determines which track a buyer will underwrite, and the tracks are not equally generous. A site that cleanly supports a 100+ unit building with a 35-year exemption is a fundamentally different offer than one that only supports a small building without triggering the wage rules below.

The Construction Wage Floor — a Real Factor in Site Selection

485-x added construction-worker minimum wage requirements that most of 421-a never had, kicking in at 100+ units (roughly $40–42/hour, citywide, escalating annually) and rising further for 150+ unit projects in higher-cost Zone A/B areas. This is a meaningful reason developers have gravitated toward the sub-100-unit Modest Rental track wherever a site allows it — it captures a full 35-year benefit while avoiding the wage floor entirely. If your site is right at that 100-unit threshold, expect a buyer's underwriting to be sensitive to exactly which side of the line their project lands on.

Where the Density Comes From

The same 2024 budget that created 485-x also repealed the state's old 12.0 FAR residential density cap, and City of Yes for Housing Opportunity (adopted December 2024) built the mechanisms to use that new headroom — most notably a 20% floor-area bonus for buildings that dedicate the added space to affordable units. Affordable units built to earn that zoning bonus can also count toward a project's 485-x affordability requirement, so the two programs frequently stack on the same site. See our rezoning guide for how to check whether your zoning changed.

The Bottom Line for Sellers

A buyer's offer on your development site is really an offer on the building they can build and the tax bill that building will carry. Two lots with identical zoning can support meaningfully different offers depending on whether the planned project cleanly fits a 485-x track — which is exactly why understanding this program is part of understanding your land value, not a separate question from it.