C3A is a commercial zoning district governed by ZR 33-12, with commercial far of 0.5.
These are the figures the engine applies when it models a lot in C3A. Where a rule differs between a narrow and a wide street, both are shown.
| Commercial FAR | 0.5 | ZR 33-12 |
|---|---|---|
| Community facility FAR | 1 | ZR 33-12 |
| Residential bulk equivalent | R3A | ZR 34-112 |
| Front yard | 0 ft | ZR 23-45 |
|---|---|---|
| Side yard | 0 ft | ZR 23-46 |
| Rear yard | 20 ft | ZR 23-47 |
| Lot coverage — corner lot | 100% |
At 0.5 FAR, a 10,000 square foot lot in C3A carries roughly 5,000 square feet of zoning floor area.
That is the ceiling, not the answer. The height envelope, required yards, lot shape, street width, overlays and any special district all cut into it. Running the real lot is the only way to know which constraint binds first.
Every area of the city zoned C3A, from NYC Planning’s published zoning district layer.
Use groups permitted in C3 districts:
Underbuilt here means a lot of at least 2,500 square feet, built to less than half its residential floor area, in private hands, with at least 20,000 square feet of unused capacity. From PLUTO 26v2. How we counted.
C3A has a commercial far of 0.5, set by ZR 33-12. On a 10,000 square foot lot that is about 5,000 square feet of zoning floor area before any bonus, and before the height envelope and yard requirements are applied.
C3A is not governed by a flat height cap in the quality housing tables; height is controlled by the sky exposure plane and the bulk rules shown above.
Source: NYC Planning zoning districts.