NYC Zoning Handbook:
Residential Districts: R9

The city's R9 districts are mapped along some major avenues and crosstown streets south of 96th Street in Manhattan. R9 zoning is not found in any other borough. The FAR ranges from 0.99 to 7.52, with density* ranging from 387 to 425 units per acre. The higher FAR typically produces 17-story buildings with low lot coverage that are set back from the street. R9 districts have the lowest open space requirement of any residential district (except R10, where none is required). Parking must be provided for 40 percent of the dwelling units. The Quality Housing Program is optional in R9 districts.

*Density maximums (the number of dwelling units per acre) are based on an average of 2 1/2 rooms per dwelling unit.

Basic Data

R9: General residence district
Maximum FAR: 0.99 to 7.52
Minimum OSR: 1.0 to 6.2
Minimum lot area per room: 45 to 41 square feet
Maximum rooms per acre: 968 to 1,062
Required parking: 40% of dwelling units
Quality Housing Program: Optional