858,644 PARCELS SCANNED

Underbuilt parcels in Bronx

Every lot below is built under the density its zoning already allows. The gap is unused floor area ratio — the space City of Yes made buildable in December 2024, ranked largest first.

Underbuilt parcels in Bronx, ranked by unused floor area ratio
728 RIVER AVENUE
BBL 2024820006 · 40,042 sq ft lot
C6-3D · Bronx
0.00 / 9.00
+9.00unused FAR
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51 EAST 161 STREET
BBL 2024840005 · 11,503 sq ft lot
C6-3D · Bronx
0.26 / 9.00
+8.74unused FAR
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903 SHERIDAN AVENUE
BBL 2024600018 · 9,005 sq ft lot
C4-6 · Bronx
1.98 / 10.00
+8.02unused FAR
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48 EAST 161 STREET
BBL 2024830040 · 9,061 sq ft lot
C6-3D · Bronx
0.99 / 9.00
+8.01unused FAR
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62 EAST 161 STREET
BBL 2024830045 · 12,190 sq ft lot
C6-3D · Bronx
1.00 / 9.00
+8.00unused FAR
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67 EAST 161 STREET
BBL 2024840035 · 11,503 sq ft lot
C6-3D · Bronx
1.00 / 9.00
+8.00unused FAR
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76 EAST 161 STREET
BBL 2024740040 · 10,376 sq ft lot
C6-3D · Bronx
1.01 / 9.00
+7.99unused FAR
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830 RIVER AVENUE
BBL 2024830032 · 3,948 sq ft lot
C6-3D · Bronx
1.20 / 9.00
+7.80unused FAR
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RIVER AVENUE
BBL 2024960064 · 27,000 sq ft lot
R9A · Bronx
0.00 / 7.52
+7.52unused FAR
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CROMWELL AVENUEVacant lot
BBL 2028710133 · 1,365 sq ft lot
R9A · Bronx
0.00 / 7.52
+7.52unused FAR
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1221 RIVER AVENUEVacant lot
BBL 2024890026 · 2,000 sq ft lot
R9A · Bronx
0.00 / 7.52
+7.52unused FAR
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EDWARD L GRANT HWY
BBL 2025060040 · 17,635 sq ft lot
R9A · Bronx
0.00 / 7.52
+7.52unused FAR
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850 RIVER AVENUE
BBL 2024830034 · 17,517 sq ft lot
C6-3D · Bronx
1.57 / 9.00
+7.43unused FAR
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1355 CROMWELL AVENUE
BBL 2028710085 · 25,654 sq ft lot
R9A · Bronx
0.19 / 7.52
+7.33unused FAR
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881 GERARD AVENUE
BBL 2024840033 · 13,600 sq ft lot
C6-3D · Bronx
1.69 / 9.00
+7.31unused FAR
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1240 EDWARD L GRANT HWY
BBL 2028710002 · 59,050 sq ft lot
R9A · Bronx
0.44 / 7.52
+7.08unused FAR
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1245 JEROME AVENUE
BBL 2028550012 · 3,685 sq ft lot
R9A · Bronx
0.54 / 7.52
+6.98unused FAR
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880 RIVER AVENUE
BBL 2024840009 · 19,306 sq ft lot
C6-3D · Bronx
2.28 / 9.00
+6.72unused FAR
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1347 CROMWELL AVENUE
BBL 2028710110 · 5,894 sq ft lot
R9A · Bronx
0.82 / 7.52
+6.70unused FAR
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1251 JEROME AVENUE
BBL 2028550015 · 3,797 sq ft lot
R9A · Bronx
0.84 / 7.52
+6.68unused FAR
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1222 JEROME AVENUE
BBL 2024890006 · 3,931 sq ft lot
R9A · Bronx
0.87 / 7.52
+6.65unused FAR
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40 EAST 167 STREET
BBL 2024880020 · 5,200 sq ft lot
R9A · Bronx
0.88 / 7.52
+6.64unused FAR
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1388 JESUP AVENUE
BBL 2028720050 · 10,488 sq ft lot
R9A · Bronx
0.92 / 7.52
+6.60unused FAR
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17 EAST 167 STREET
BBL 2024890027 · 3,480 sq ft lot
R9A · Bronx
0.93 / 7.52
+6.59unused FAR
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12 EAST 167 STREET
BBL 2024960058 · 11,000 sq ft lot
R9A · Bronx
0.96 / 7.52
+6.56unused FAR
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Showing the top 25 parcels by unused FAR. Source: NYC Department of City Planning PLUTO, via NYC Open Data.

How to read this

Floor area ratio is the multiple of the lot area a building may cover. A 2,500 sq ft lot zoned for 6.0 FAR permits roughly 15,000 sq ft of building.

Unused FAR is what zoning allows minus what stands there now. A lot at 0.00 built against 6.02 allowed is vacant or near-vacant in a district zoned for an apartment building.

Vacant lot marks a parcel PLUTO records as vacant land, with no building area and no units. A reading of 0.00 built FAR on one of these is the lot being empty, not the data being missing.

City of Yes for Housing Opportunity, adopted December 2024, was the largest zoning change in NYC since 1961. It added density in residential and commercial districts across all five boroughs.

What is excluded. Parkland, transit and utility parcels, and public institutions are filtered out — they carry unused FAR on paper but cannot be privately developed. Lots under 1,000 sq ft are excluded as too small to build on.

A large gap is a starting point, not a verdict. Lot shape, landmark status, flood zone, and existing tenancy all decide whether it can be built. Read the methodology.