420 Bay Street, Staten Island 10304 is a 7,195 square foot lot zoned R6. RunEnvelope’s engine finds an as-of-right scheme with homes of 28,060 sf (AIRS Senior Housing (100% Affordable)), against 7,325 sf built on the lot today.
That leaves 20,735 sf more floor area than stands here now, if the existing building were replaced. The largest scheme with homes and no affordability obligation holds 21,585 sf (Shared Housing (SRO)).
City Planning’s PLUTO file lists a residential FAR of 2.43 for this lot, which at 7,195 sf of land is 17,484 sf. The engine’s largest residential-only scheme without an affordability obligation (Shared Housing (SRO)) holds 21,585 sf, 23% more than that simple multiplication suggests.
Quality Housing height limit in R6 on a wide street: 75 ft (95 ft with the affordability preference). From the district’s rule set.
The largest 6 as-of-right schemes RunEnvelope’s engine produced for this lot, by zoning floor area. A full study also models the building itself: floor plates, heights, setbacks, unit mix and parking.
| Scheme | Type | Floor area | FAR | Homes |
|---|---|---|---|---|
| AIRS Senior Housing (100% Affordable) | Income-restricted housing | 28,060 | 3.90 | 31 |
| Shared Housing (SRO) | Shared housing (rooms) | 21,585 | 3.00 | 73 rooms |
| Max Apartments | Housing | 21,585 | 3.00 | 31 |
| Commercial Overlay | Mixed use with homes | 21,585 | 3.00 | 16 |
| Baseline: Standard Residences (As-of-Right) | Baseline | 21,585 | 3.00 | 16 |
| Existing Building: Retain & Enlarge (ZR 54-31) | Keeps existing building | 21,585 | 3.00 | None |
Floor area is zoning floor area in square feet. Highlighted: the largest scheme with homes. Income-restricted schemes (Universal Affordability Preference, AIRS senior housing) require a share or all of the homes to be affordable. Shared housing counts rooms, not apartments. Schemes that need a landmark transfer of development rights, the FRESH food store bonus or a stack of every program are left off this page; the full study shows them.
As-of-right only: what the Zoning Resolution allows without a variance, special permit or rezoning. Computed by RunEnvelope’s zoning engine on October 18, 2026 from PLUTO 26v2 lot data, in screening mode: the engine uses the City’s recorded lot area and dimensions, not a surveyed lot outline.
This is not a professional opinion, an appraisal or a statement that anything will or should be built here. Existing tenants, leases and the owner’s plans are not part of it.
Why this lot has a page: we publish pages only for lots that clear a set of data quality and headroom tests.
The closest published lots in Staten Island, same zoning district first. All Staten Island lots.