🏗
Bulk Regulations — Interactive 3D Envelope
Drag the sliders to see how each NYC zoning rule reshapes what you can build on a hypothetical New York City lot. The base mass (blue) sits within the yard setbacks; the tower (purple) is set back by the sky-exposure plane.
FAR
setbacks
sky-exposure
height
lot coverage
Preset district
Loading 3D viewer…
Lot area
10,000 sf
Footprint
6,500 sf
Buildable GFA
30,000 sf
Floors
5
Effective height
50'
Base height
60'
Sky setback at base
34.6'
Coverage limit
6,500 sf
100
100
3.0
75
65%
0
30
0
30°
Drag sliders to see live changes. Camera rotates automatically; drag to look around or scroll to zoom.
How to read the envelope
- Green strips = required yard setbacks (front / rear / side). No building allowed here.
- Blue mass = base mass. Sits flat on the footprint up to the “max base height” (60ft default).
- Purple mass = tower portion above the base, stepped back per the sky-exposure plane angle. Higher angle = more lean-back.
- Lot coverage caps the footprint regardless of yards. The lower of (lot − yards) and (coverage × lot) wins.
- FAR drives the total buildable floor area. The number of floors = total GFA ÷ effective footprint.
Sky-exposure plane angles are approximated by district family until Phase 4b sky-plane data extraction is complete. Precise per-district values per ZR §23-63 / §33-43.