NYC Zoning Handbook:
Residential Districts: R4 Infill

Special infill housing provisions encourage the construction of multifamily, three-story buildings with a basement in R4 districts characterized by attached homes and small multiple dwellings. An FAR of 1.35 and higher density regulations permit developments with greater bulk and more dwelling units than in R4 districts. To ensure that infill housing generally conforms to existing neighborhood scale, there is a maximum perimeter wall height of 25 feet that can rise to 35 feet, usually behind a setback or under a pitched roof. The maximum zoning lot size is 1.5 acres. Infill housing can be built only on blocks that are at least 50 percent developed. Buildings must be set back 18 feet to prevent cars parked in front yard driveways from jutting onto sidewalks. If parking is grouped, space must be provided for at least 66 percent of the dwelling units.

The infill regulations are not applicable to lots occupied by single- or two-family detached or semi-detached houses on residential blockfronts where such houses predominate.

Basic Data

R4 INFILL: All housing types

Minimum lot size:
Detached, single- or two-family: 3,800 square feet lot area; 40 foot lot width
Other 1,700 square feet; 18 foot lot width
Maximum FAR: 1.35
Maximum lot coverage: 55%
Minimum lot area per DU: 666 feet
Maximum DUs per acre: 65 Front yard: 18 feet minimum
Side yards:
Detached (2 required): 13 feet total (minimum); 5 feet minimum
Semi-detached (1 required): 8 feet minimum
Other (2): 8 feet each (minimum), or 10% of building length
Maximum building height: 35 feet; perimeter wall height: 25 feet
Maximum street wall length: 185 feet
Required parking: One space per dwelling unit or 66% of dwelling units if grouped

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