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673 City Island Avenue zoning and development potential

673 City Island Avenue, Bronx 10464 is a 77,135 square foot lot zoned C3. RunEnvelope’s engine finds an as-of-right scheme with homes of 77,135 sf (Residential + Community Facility), against 5,000 sf built on the lot today.

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The lot

BBL
2-05636-0158
Block / lot
5636 / 158
Community district
Bronx Community District 10
Zoning
C3
Lot area
77,135 sf
Frontage x depth
125 ft x 440 ft
Lot type
Inside
Current use
Commercial and office
Built today
5,000 sf, 2 floors
Year built
1931
Built FAR
0.06

Permitted floor area against what is built

Built on the lot today5,000 sf
Largest scheme with homes: Residential + Community Facility77,135 sf

That leaves 72,135 sf more floor area than stands here now, if the existing building were replaced.

City Planning’s PLUTO file lists a residential FAR of 0.75 for this lot, which at 77,135 sf of land is 57,851 sf. The engine’s largest residential-only scheme without an affordability obligation (Max Apartments) holds 57,851 sf, close to that simple multiplication.

  • Wide street frontage
  • Flood zone VE (special flood hazard area)
  • Coastal zone
  • Irregular lot shape

Development scenarios

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.

SchemeTypeFloor areaFARHomes
Residential + Community FacilityMixed use with homes77,1351.0044
Community FacilityCommunity facility76,6300.99None
Commercial OverlayMixed use with homes57,8520.7521
Max ApartmentsHousing57,8510.7585
Max Residential (Parking Waiver: 14 units)Housing57,8510.7514
Max CommercialCommercial38,2410.50None

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.

What these numbers are

As-of-right only: what the Zoning Resolution allows without a variance, special permit or rezoning. Computed by RunEnvelope’s zoning engine on October 25, 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.

What a full study checks

  • ■The actual lot outline, street frontages and yards, not PLUTO's recorded dimensions
  • ■Easements, restrictive declarations and zoning lot agreements on record
  • ■Landmark, waterfront and flood rules that apply to the specific building
  • ■Height, setback and floor-by-floor massing, with floor plans
  • ■Unit count, parking and the affordability program terms

Why this lot has a page: we publish pages only for lots that clear a set of data quality and headroom tests.

Nearby lots with similar potential

583 City Island AvenueR3A · 0.2 mi away60,325 sf of room to build565 City Island AvenueR3A · 0.24 mi away67,650 sf of room to build2 City Island AvenueR3A · 1.42 mi away97,100 sf of room to build1 City Island AvenueR3A · 1.45 mi away81,587 sf of room to build

The closest published lots in The Bronx, same zoning district first. All The Bronx lots.

This is the screening number. Get the study for 673 City Island Avenue.

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