NYC Zoning Handbook:
Residential Districts: R9X
The regulations of R9X districts are similar to those of R9A
districts except for minor variations in street wall height,
sky exposure planes and a higher allowable residential
density. They typically encourage 15-story residential
buildings with high lot coverage. This district is currently
mapped in Manhattan on Lexington Avenue on the Upper East
Side and in the Murray Hill area.
The FAR in R9X districts is 9.0. On wide streets, the first
two stories of the front wall of a new building must abut the
street line and occupy the full width of the lot On narrow
streets, the front wall of a new building must not be farther
from the street than the front wall of an adjacent building.
The maximum building height and setbacks are determined by
the building envelope which may not be penetrated by the
building. The building envelope is controlled by the
intersection of front and rear sky exposure planes that rise
according to a specific ratio. The Quality Housing Program is
mandatory in R9X districts.
Basic Data
R9X: General residence district
- Maximum FAR: 9.0
- Maximum lot coverage:
- Corner lot 80%
- Interior or through-lot: 70%
- Maximum street wall height: 120 feet
- Minimum lot area per DU: 88 square feet
- Maximum DUs per acre: 495
- Required parking: 40% of dwelling units
- Quality Housing Program: Mandatory
