485X / Sep 3, 2026
Zone A and Zone B: why 485-x geography changes the deal
For very-large rental projects, location can change affordability, benefit duration and wage formulas.
Zone A and Zone B are statutory geographies that become especially important when a project reaches 150 residential units.
What geography changes
A qualifying 150+ unit project in Zone A or Zone B can fall into the very-large Option A framework. HPD summarizes this profile as a 40-year benefit with 25% affordable units averaging 60% AMI. Separate enhanced construction wage formulas apply in Zone A and Zone B.
Do not rely on a neighborhood nickname
The statutory descriptions use tax-lot and neighborhood-tabulation-area boundaries. A brokerage neighborhood label is not a legal zone determination. Project teams should map the exact zoning/tax lot against current official geography.
Model location before the land price is final
If a site can support 150+ units, zone status belongs in acquisition diligence. It can affect labor, affordability and tax-benefit assumptions—three items that directly influence residual land value.