Public Ground

Plate 44 of 102BrooklynBrooklyn Community Board 2

240 Nassau

This site can hold about 360–459 homes under the zoning maximum for qualifying affordable housing. The top of that range is set by the dwelling unit limit (ZR 23-52); qualifying senior housing is exempt from it and could hold up to about 516. The City's LIFT tracker lists 1,502 homes. That is more than the 459 homes the dwelling unit limit (ZR 23-52) allows under current zoning on the lots shown here; it is also more than the high estimate for qualifying senior housing, which the limit does not cover.

The 1,502 homes span both lots and depend on the pending rezoning; about 702 of them would be on the private lot.

  • Index entry
  • Tracker status: Pre-Public Approval
  • Lead agency: ECF

View in ZoLa (lot 1 of 2)Checks and sources

Plate 44. 240 Nassau: 2 tax lots on 2 blocks, Brooklyn. The site is tinted pink; neighboring lots are outlined and other City-owned lots are hatched.901091101211225017128251Brooklyn Queens Connecting HighwayConcord StreetFlushing AvenueGold StreetNassau StreetNavy StreetPrince StreetN0250 ft

2 tax lots on 2 blocksTax lots from MapPLUTO; street names from the Digital City Map. Pink: this site. Hatched: other City-owned lots. Heavy lines: block edges.

What City documents say

Facts from City documents that bear on the figures below. Each is quoted in the sources, and each speaks as of its document's date.

  • Occupied public school on the City lot, to be replaced

    The City lot holds a 1953 school building used by P.S. 287 and Community Roots Charter School. The 2026 application would replace it with a new public school in the development.

  • Project includes a private lot next door

    The project joins the City's school lot with a privately owned lot at 240 Nassau Street (Block 110, Lot 25), now used by the Madison Square Boys & Girls Club. The two lots would become one zoning lot.

  • Rezoning from R6 to C6-12 is in public review

    The 1,502 homes depend on a rezoning, text amendment and special permit (C 260395 ZMK, N 260396 ZRK, C 260397 ZSK; ZAP project 2026K0233). The application was certified on July 27, 2026 and was in public review as of August 2026.

  • Developer chosen by the school construction fund, 2025

    The NYC Educational Construction Fund issued a request for expressions of interest in June 2024 and selected 240 Nassau Street Holdings, LLC in December 2025.

  • Street width from a City document

    The July 2026 project description says Navy Street along the site is a wide street whose width varies from 80 to 100 feet; the figures here use 80 feet.

Floor area follows exactly from the Zoning Resolution. Homes are a range, because unit size and building efficiency are choices.

Lot area
80,044 sq ft
Zoning district
R6
Maximum residential floor area
227,121 sq ft55,632 sq ft R6 × (0.716 × 3.00 + 0.284 × 2.20) + 24,412 sq ft R6 × (0.981 × 3.00 + 0.019 × 2.20)
With qualifying affordable or senior housing
312,172 sq ft80,044 sq ft × 3.90 FAR
Maximum community facility floor area
384,211 sq ft80,044 sq ft × 4.80 FAR

Homes, as a range

CaseHomesHow
Low364312,172 sq ft × 0.7 ÷ 599 sq ft
Base451312,172 sq ft × 0.8 ÷ 553 sq ft
High459312,172 sq ft × 0.85 ÷ 514 sq ft = 516, less where each of the 2 separate zoning lots reaches its dwelling unit limit (ZR 23-52: 95,207 ÷ 680 → 140; 216,965 ÷ 680 → 319)

Floor area × efficiency ÷ average home size. Efficiency 0.7–0.85; average home 514–599 sq ft. Assumptions and their basis.

What binds first

Flood hazard

About 10% of the site (7,980 sq ft) is in FEMA's 2015 Preliminary Flood Insurance Rate Map 1% annual chance floodplain (zone AE). NYC uses this map for flood-resistant construction rules. Flood-resistant construction shapes the ground floor and can reduce usable floor area.

What the neighborhood asked for

Brooklyn Community Board 2's formal requests to the City, from its annual Statement of Community District Needs and Budget Requests.

Each quotation below was found word for word on the cited page by script. None reviewed by a person yet.

Other requests in these categories

  • LibrariesCapital request to Brooklyn Public Library

    Clinton Hill BPL Renovation

    “BKCB2 recommends $13.5M in increased funding for the Clinton Hill Brooklyn Public Library to cover forecasted needs including facade and window work, heating and cooling …”

    FY2027 statement, p. 36 · priority 1 of 3 within the agency · awaiting a person's review

    ResponseIt is recommended that this request be brought to the attention of your Elected Officials.

  • LibrariesExpense request to Brooklyn Public Library

    Extended Library Operating Hours

    “BKCB2 recommends increased funding for our 6 Brooklyn Public Library branches to 1) facilitate extended 8pm daily closures at all locations, and 2) permanent Sunday …”

    FY2027 statement, p. 43 · priority 1 of 1 within the agency · awaiting a person's review

    ResponseThis request includes more than one proposal. The agency has recommended funding for this request in part. OMB supports the agency's position.

  • LibrariesCapital request to Brooklyn Public Library

    Center for Brooklyn History Renovations

    “BKCB2 recommends $54M in funding for the Brooklyn Public Library Center for Brooklyn History to cover necessary renovations including infrastructure work (heating and cooling, electrical …”

    FY2027 statement, p. 36 · priority 2 of 3 within the agency · awaiting a person's review

    ResponseIt is recommended that this request be brought to the attention of your Elected Officials.

  • LibrariesCapital request to Brooklyn Public Library

    Adams St BPL Storage & Staff Space Upgrades

    “BKCB2 recommends funding for interior improvements at the Adams Street public library to accommodate proper and safe maintenance and cleaning supply storage. …”

    FY2027 statement, p. 36 · priority 3 of 3 within the agency · awaiting a person's review

    ResponseThe agency will accommodate part of this request within existing resources.

  • HealthCapital request to Health and Hospitals Corporation

    More Substance Abuse Program Mobile Outreach Units

    “BKCB2 recommends increased funding for Street Health Outreach & Wellness (S.H.O.W.) mobile units in and around Downtown Brooklyn and its main arterials: …”

    FY2027 statement, p. 41 · priority 1 of 1 within the agency · awaiting a person's review

    ResponseFurther investigation is required. Contact the agency.

  • Open spaceCapital request to Department of Parks and Recreation

    Adam Yauch Dog Run

    “BKCB2 recommends funding to support the Parks Dept's stated need for $3.5M to renovate the Willowtown Dog Run at Adam Yauch Park.”

    FY2027 statement, p. 40 · priority 11 of 11 within the agency · awaiting a person's review

    ResponseThe agency recommends funding this budget request, but at this time the availability of funds is uncertain. OMB supports the agency's position.

6 other requests in these categories are listed on the web page.

What gets in the way

Flags are flags, not verdicts. Each comes from a public layer, named in the sources.

  • Hazard

    In the 1% annual chance floodplain (2015 preliminary map)

    About 10% of the site (7,980 sq ft) is in FEMA's 2015 Preliminary Flood Insurance Rate Map 1% annual chance floodplain (zone AE). NYC uses this map for flood-resistant construction rules.

  • Hazard

    Stormwater flooding in a moderate storm (2050s)

    DEP's Stormwater Flood Map (moderate stormwater flood with 2050 sea level rise) shows nuisance flooding (4 in to 1 ft) and deep and contiguous flooding (1 ft or more) on about 1% of the site (1,080 sq ft).

  • Hazard

    Stormwater flooding in an extreme storm (2080s)

    DEP's Stormwater Flood Map (extreme stormwater flood with 2080 sea level rise) shows nuisance flooding (4 in to 1 ft) and deep and contiguous flooding (1 ft or more) on about 4% of the site (3,310 sq ft).

  • Caution

    1 of 2 lots not recorded as City-owned

    MapPLUTO records block 110 lot 25 with no ownership type, not as City property (owner recorded as “240 NASSAU STREET OWNER, LLC”).

  • Caution

    Every lot has a building on it

    Block 110 lot 25 has a building on record with 24,180 sq ft of gross building area, completed around 1975; Block 111 lot 1 has a building on record with 111,439 sq ft of gross building area, completed around 1952 (MapPLUTO; gross area includes space zoning does not count). The July 2026 project description gives the school building about 111,439 sq ft on three stories and says it was constructed in 1953. Zoning counts floor area already on a lot toward its maximum, so the figures above are the most the land could hold in total, not what could be added while those buildings stand.

  • Note

    An optional building form allows a little more

    Beyond 100 feet of a wide street in R6, ZR 23-22 allows standard residences 2.20 FAR. A building using the optional sky exposure plane rules (ZR 23-73) may reach up to 2.43 FAR, depending on how tall it is and how much open space it keeps, but that ratio then applies to all its homes, affordable ones included, so the affordable figure does not rise.

Nearest subway station: York St (F), 0.3 mi in a straight line.

What this doesn't account for

Public data and the zoning text answer the questions above. These need information that is not public, or a decision that belongs to the City.

  • Public land use review (ULURP). Selling or leasing City land, or approving a housing project on it, generally goes through ULURP (community board, borough president, City Planning Commission, City Council), and this estimate does not presume the outcome.
  • Disposition of City property (Charter 384 / UDAAP). Transferring the land needs Mayoral approval under Charter Sec. 384 and, for HPD projects, usually Urban Development Action Area designation and project approval under NY General Municipal Law Article 16.
  • Environmental review (CEQR/SEQRA). Any discretionary approval, disposition or City funding triggers CEQR/SEQRA review, which can require mitigation (e.g. for hazardous materials, noise or historic resources) or reshape the project.
  • (E) designations. A lot with an (E) designation or environmental restrictive declaration for hazardous materials, air quality or noise cannot receive building permits until the Office of Environmental Remediation signs off.
  • Subsurface and site conditions. Unknown soil, rock, groundwater and contamination can shrink or eliminate cellars and add foundation and cleanup costs, and HPD requires every project to investigate and, if needed, remediate contamination.
  • Deed restrictions and reverter clauses. Land the City bought or sold may carry deed restrictions or reverter clauses limiting its use, which must be checked in title records (ACRIS) and DCAS's deed-restriction database.
  • Parkland alienation. If a site is municipal parkland, it cannot be sold or used for housing without an act of the State Legislature signed by the Governor.
  • Current occupants, uses and agency plans. Many City-owned lots are in active use or assigned to an agency, or have funded capital projects, and this estimate does not reflect relocation needs or agency plans (check COLP and the Capital Commitment Plan).
  • Mapped streets, easements and utilities. Mapped-but-unbuilt ('paper') streets, sewer and water easements and utility lines can take land out of the buildable area, and no permit may be issued for a building in the bed of a mapped street.
  • Street access. A lot with no frontage on a mapped street cannot get a building permit on its own and must be combined with a neighboring lot or have access mapped.
  • Landmarks review. Sites that are individual landmarks or inside historic districts need Landmarks Preservation Commission approval, which can limit demolition, height and bulk.
  • Flood-resistant construction. Sites in the 1% annual chance floodplain (or the 0.2% shaded X-Zone for critical facilities) must meet Building Code Appendix G, whose elevation and floodproofing rules can cost usable ground-floor and cellar space.
  • Airport height limits. Near JFK, LaGuardia and Floyd Bennett Field, zoning flight-obstruction surfaces cap building height, and tall structures anywhere need FAA notice.
  • State and federal funding conditions. Federal or State money brings its own requirements (e.g. HUD environmental review under 24 CFR Part 58, Davis-Bacon prevailing wages, Section 3 hiring) that can change cost, timing and program.
  • Zoning capacity is a ceiling, not a plan. The figures show what zoning allows, and actual HPD projects often build less, for example to fit neighborhood context, a community facility or funding limits.

Checks

What has been verified on this page, and by what.

Tax lots (2)
3-00110-0025, 3-00111-0001Confirmed against 240 Nassau Street land use application, Project Description (ZAP 2026K0233), filed by NYC Educational Construction Fund and 240 Nassau Street Holdings, LLC
Lot and zoning records compared with DCP's live data
Agrees
Figures reproduced by a separate calculation
Agrees
Notes
On September 25, 2026, the MapPLUTO records and zoning district map behind this page were compared with DCP's live MapPLUTO (26v2) and zoning district layers for both of its lots; every compared field and district boundary matched. A separate calculation, written from the method page and run on the same downloaded City data on September 25, 2026, reproduced both lots and their area (80,044 sq ft), the zoning portions, the floor area (standard 227,121; with qualifying affordable or senior housing 312,172; community facility 384,211 sq ft), the homes (low 364, base 451, high 459), and the flags and what limits the site first.

Sources

Superscript numbers next to figures refer to this list. Select one to see the source.

  1. LIFT Tracker (Land Inventory Fast Track), ArcGIS layer LIFT_Tracker/FeatureServer/0Dataset · NYC Mayor's Office · as of July 30, 2026 · retrieved September 23, 2026
  2. 240 Nassau Street land use application, Project Description (ZAP 2026K0233), filed by NYC Educational Construction Fund and 240 Nassau Street Holdings, LLC, PDF page 1, section 1 'Introduction'Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  3. 240 Nassau Street Project Description (ZAP 2026K0233), PDF page 1, section 1Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  4. 240 Nassau Street Project Description (ZAP 2026K0233), PDF page 5, section 4, 'Lot 1'Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  5. 240 Nassau Street Project Description (ZAP 2026K0233), PDF page 5, section 4, 'Lot 25'Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  6. ZAP project record 2026K0233 (240 Nassau Street), JSON attribute 'dcp-publicstatus'Document · NYC Department of City Planning (ZAP API) · as of August 10, 2026
  7. 240 Nassau Street Project Description (ZAP 2026K0233), PDF page 1, section 2Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  8. 240 Nassau Street Project Description (ZAP 2026K0233), PDF page 5, section 4 'Description of the Proposed Development Site'Document · NYC Department of City Planning, Zoning Application Portal (applicant filing) · as of July 21, 2026
  9. MapPLUTO 26v2Dataset · NYC Department of City Planning · as of September 9, 2026 · retrieved September 25, 2026
  10. Zoning Resolution § 23-22, R6; Not within 100 ft of a wide street: 2.20 FARZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  11. Zoning Resolution § 23-22, R6; Within 100 ft of a wide street: 3.00 FARZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  12. Zoning Resolution § 23-22, R6, qualifying affordable housing or qualifying senior housing: 3.90 FARZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  13. Zoning Resolution § 24-11, R6: 4.80 FARZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  14. Declared assumption: building efficiency, low 0.7, base 0.8, high 0.85Declared assumption · as of September 23, 2026
  15. Declared assumption: average home size (net), low 514, base 553, high 599 sq ftDeclared assumption · as of September 23, 2026
  16. Zoning Resolution § 23-52, Dwelling unit factor 680Zoning Resolution · NYC Department of City Planning
  17. FEMA 2015 Preliminary Flood Insurance Rate Map (flood hazard zones) 360497_20150130Dataset · FEMA, via NYC Department of City Planning · as of March 16, 2026 · retrieved September 25, 2026
  18. 2022 NYC Building Code, Appendix G (Flood-Resistant Construction), § G102.2Document · NYC Department of Buildings
  19. FEMA 2015 Preliminary Flood Insurance Rate Map: area of each lot in each zone 360497_20150130Dataset · FEMA, via NYC Department of City Planning · as of March 16, 2026 · retrieved September 25, 2026
  20. NYC Stormwater Flood Map: Moderate stormwater flood with 2050 sea level riseDataset · NYC Department of Environmental Protection, via NYC Department of City Planning · as of September 8, 2025 · retrieved September 25, 2026
  21. NYC Stormwater Flood Map: Moderate stormwater flood with 2050 sea level rise: area of each lot in each categoryDataset · NYC Department of Environmental Protection, via NYC Department of City Planning · as of September 8, 2025 · retrieved September 25, 2026
  22. NYC Stormwater Flood Map: Extreme stormwater flood with 2080 sea level riseDataset · NYC Department of Environmental Protection, via NYC Department of City Planning · as of September 8, 2025 · retrieved September 25, 2026
  23. NYC Stormwater Flood Map: Extreme stormwater flood with 2080 sea level rise: area of each lot in each categoryDataset · NYC Department of Environmental Protection, via NYC Department of City Planning · as of September 8, 2025 · retrieved September 25, 2026
  24. Zoning Resolution § 23-731, Sky exposure plane buildings: applicabilityZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  25. Zoning Resolution § 23-732, Sky exposure plane buildings: maximum floor area ratio by height factorZoning Resolution · NYC Department of City Planning · as of September 10, 2026
  26. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027, PDF p. 36Document · NYC Department of City Planning · retrieved September 23, 2026
  27. FY2027 Register of Community Board Budget Requests (Adopted Budget), Brooklyn Community Board 2 FY2027 Adopted, Agency responseDocument · NYC Office of Management and Budget · as of June 30, 2026
  28. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027, PDF p. 43Document · NYC Department of City Planning · retrieved September 23, 2026
  29. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027, PDF p. 41Document · NYC Department of City Planning · retrieved September 23, 2026
  30. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027, PDF p. 40Document · NYC Department of City Planning · retrieved September 23, 2026
  31. MTA Subway StationsDataset · Metropolitan Transportation Authority · as of September 25, 2026 · retrieved September 25, 2026
  32. Digital City Map street centerlinesDataset · NYC Department of City Planning · as of December 1, 2025 · retrieved September 25, 2026
  33. New York City Charter Sec. 197-c (Uniform land use review procedure), Sec. 197-c(a)(8) and (a)(10)Document
  34. NYC Charter Sec. 384 (Disposal of property of the city), Sec. 384(a)Document
  35. CEQR Technical Manual, Chapter 2 (December 2025 edition), PDF p. 1 (printed p. 2-1)Document
  36. Zoning Resolution 11-15 (Environmental Requirements), ZR 11-15(a); last amended 2012-03-28Document
  37. HPD Design Guidelines for New Construction 2026, PDF p. 13, Secs. 1.1.1 and 1.1.4Document
  38. Deed Restriction Database (NYC Open Data rfu7-paqe), dataset descriptionDocument
  39. Handbook on the Alienation and Conversion of Municipal Parkland (NYS OPRHP, revised 2017-09-01), PDF p. 3, 'Parkland Alienation'Document
  40. City Owned and Leased Property (COLP), NYC Open Data fn4k-qyk2, dataset description (version 20260430)Document
  41. NY General City Law Sec. 35, GCL 35Document
  42. NY General City Law Sec. 36, GCL 36Document
  43. LPC - Applications page, page textDocument
  44. 2022 NYC Building Code, Appendix G (as amended by Local Law 77 of 2023), PDF p. 1, Sec. G102.1Document
  45. Zoning Resolution 61-21 (Restriction on Highest Projection of Building or Structure), ZR 61-21; 61-11 designates JFK, LaGuardia and U.S. Naval Air Station (Floyd Bennett Field)Document
  46. HPD ELLA Term Sheet (updated 2020-03-10), PDF p. 4Document
  47. CPC report C 260071 HAM (1727 Amsterdam Avenue), PDF p. 8Document
  48. Zoning districts (NYZD)Dataset · NYC Department of City Planning · as of August 17, 2026 · retrieved September 25, 2026
1. LIFT Tracker (Land Inventory Fast Track)
Dataset · NYC Mayor's Office
Where
ArcGIS layer LIFT_Tracker/FeatureServer/0
As of
July 30, 2026
Retrieved
September 23, 2026

One point per project. BBLs resolved by point-in-lot against MapPLUTO, HPD's Local Law 125 report, or address geocoding; see the method page.

Open source

2. 240 Nassau Street land use application, Project Description (ZAP 2026K0233), filed by NYC Educational Construction Fund and 240 Nassau Street Holdings, LLC
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 1, section 1 'Introduction'
As of
July 21, 2026

to facilitate the redevelopment of an approximately 79,807 square foot site (Brooklyn Block 110, Lot 25 and Block 111, Lot 1)(the "Development Site") in Downtown Brooklyn

Open source

3. 240 Nassau Street Project Description (ZAP 2026K0233)
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 1, section 1
As of
July 21, 2026

The Proposed Actions would facilitate a new approximately 1,436,526 square foot mixed-use development with approximately 1,502 dwelling units ("DUs"), of which 20 percent (302 DUs) would be permanently affordable, a new 96,000 square foot (121,000 gsf) public school

Open source

4. 240 Nassau Street Project Description (ZAP 2026K0233)
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 5, section 4, 'Lot 1'
As of
July 21, 2026

The lot is City-owned under the control of the Department of Education and is improved with an approximately 111,439 square foot, three-story public school building constructed in 1953. The school building is currently occupied by P.S. 287 Dr. Bailey K. Ashford (grades pre-Kindergarten through 5) and Community Roots Charter School (grades 6 through 8).

Open source

5. 240 Nassau Street Project Description (ZAP 2026K0233)
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 5, section 4, 'Lot 25'
As of
July 21, 2026

The lot is privately owned by 240 Nassau Street Holdings, LLC and is improved with an approximately 24,180 square foot, two-story community facility building that is currently occupied and operated by the Madison Square Boys & Girls Club.

Open source

6. ZAP project record 2026K0233 (240 Nassau Street)
Document · NYC Department of City Planning (ZAP API)
Where
JSON attribute 'dcp-publicstatus'
As of
August 10, 2026

"dcp-publicstatus":"In Public Review"

Open source

7. 240 Nassau Street Project Description (ZAP 2026K0233)
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 1, section 2
As of
July 21, 2026

In June 2024, ECF issued a Request for Expressions of Interest (RFEI) for 50 Navy Street, and in December 2025, ECF selected 240 Nassau Street Holdings, LLC's response to the RFEI

Open source

8. 240 Nassau Street Project Description (ZAP 2026K0233)
Document · NYC Department of City Planning, Zoning Application Portal (applicant filing)
Where
PDF page 5, section 4 'Description of the Proposed Development Site'
As of
July 21, 2026

Nassau and Navy Streets are considered wide streets with irregular widths that vary from 81 to 91 feet and 80 to 100 feet, respectively.

Open source

9. MapPLUTO 26v2
Dataset · NYC Department of City Planning
As of
September 9, 2026
Retrieved
September 25, 2026

Open source

10. Zoning Resolution § 23-22
Zoning Resolution · NYC Department of City Planning
Where
R6; Not within 100 ft of a wide street: 2.20 FAR
As of
September 10, 2026

R6 | 2.20 | 3.90

Open source

11. Zoning Resolution § 23-22
Zoning Resolution · NYC Department of City Planning
Where
R6; Within 100 ft of a wide street: 3.00 FAR
As of
September 10, 2026

R6A R6¹ R6-1 R7B | 3.00 | 3.90 ... ¹ For zoning lots, or portions thereof, located within 100 feet of a wide street

Open source

12. Zoning Resolution § 23-22
Zoning Resolution · NYC Department of City Planning
Where
R6, qualifying affordable housing or qualifying senior housing: 3.90 FAR
As of
September 10, 2026

R6A R6¹ R6-1 R7B | 3.00 | 3.90 ... R6 | 2.20 | 3.90

Open source

13. Zoning Resolution § 24-11
Zoning Resolution · NYC Department of City Planning
Where
R6: 4.80 FAR
As of
September 10, 2026

R6 R6-1 | 4.80 | 70 | 65

Open source

14. Declared assumption: building efficiency
Declared assumption
Where
low 0.7, base 0.8, high 0.85
As of
September 23, 2026

Net home area as a share of residential floor area. Basis: 2025 HCR Design Guidelines, PDF p. 40, Sec. 3.4.1a 'Overall Building Efficiency', Table 3.4.1; 2025 HCR Design Guidelines, PDF p. 40, Sec. 3.4.1; Market & Financial Study: NYC Mandatory Inclusionary Housing (BAE Urban Economics, BJH Advisors, James Lima Planning + Development), PDF p. 68 (printed p. 64), Appendix C, Table C-1 'Developer Interview Summary'; Market & Financial Study: NYC Mandatory Inclusionary Housing, PDF p. 41 (printed p. 37), 'Zoning and Floor Area Ratio'; HPD Design Guidelines for New Construction 2026, PDF p. 28, 'Unit Area Calculation'. A declared assumption; no City agency publishes this ratio.

Open source

15. Declared assumption: average home size (net)
Declared assumption
Where
low 514, base 553, high 599 sq ft
As of
September 23, 2026

HPD target net areas by bedroom count, weighted by HPD's observed bedroom mix. Basis: HPD Design Guidelines for New Construction 2026, PDF p. 31, Sec. 4.4.1; HPD Design Guidelines for New Construction 2026, PDF p. 33, Sec. 4.5.1; HPD Design Guidelines for New Construction 2026, PDF p. 36, Sec. 4.6.1; HPD Design Guidelines for New Construction 2026, PDF p. 39, Sec. 4.7.1; HPD Design Guidelines for New Construction 2026, PDF p. 42, Sec. 4.8.1; HPD Design Guidelines for New Construction 2026, PDF p. 6, 'Applicability'; HPD Design Guidelines for New Construction, Version 2.02 (edition in force before 2026-10-01), PDF pp. 42-58 (e.g. p. 44 for 0-BR, p. 58 for 4-BR), Secs. 5.3-5.8 tables 'TARGET NET'; HPD ELLA Term Sheet (Extremely Low & Low-Income Affordability), PDF p. 5, 'Design and Construction Requirements'; Affordable Housing Production by Building (NYC Open Data hg8x-zxpr), fields studio_units, _1_br_units ... _6_br_units; filter reporting_construction_type='New Construction' AND all_counted_units >= total_units - 1.

Open source

16. Zoning Resolution § 23-52
Zoning Resolution · NYC Department of City Planning
Where
Dwelling unit factor 680

In the districts indicated, for buildings containing multiple dwelling residences, the maximum number of dwelling units permitted shall be determined by dividing the maximum residential floor area permitted on the zoning lot by the applicable dwelling unit factor. ... For all other types of multiple dwelling residences, the applicable dwelling unit factor shall be 680. Fractions equal to or greater than three-quarters resulting from this calculation shall be considered to be one dwelling unit.

Open source

17. FEMA 2015 Preliminary Flood Insurance Rate Map (flood hazard zones) 360497_20150130
Dataset · FEMA, via NYC Department of City Planning
As of
March 16, 2026
Retrieved
September 25, 2026

Open source

18. 2022 NYC Building Code, Appendix G (Flood-Resistant Construction)
Document · NYC Department of Buildings
Where
§ G102.2

Uses FEMA's 2015 Preliminary FIRMs for flood hazard areas, and the higher of the 2007 or 2015 maps for elevations.

Open source

19. FEMA 2015 Preliminary Flood Insurance Rate Map: area of each lot in each zone 360497_20150130
Dataset · FEMA, via NYC Department of City Planning
As of
March 16, 2026
Retrieved
September 25, 2026

Open source

20. NYC Stormwater Flood Map: Moderate stormwater flood with 2050 sea level rise
Dataset · NYC Department of Environmental Protection, via NYC Department of City Planning
As of
September 8, 2025
Retrieved
September 25, 2026

Open source

21. NYC Stormwater Flood Map: Moderate stormwater flood with 2050 sea level rise: area of each lot in each category
Dataset · NYC Department of Environmental Protection, via NYC Department of City Planning
As of
September 8, 2025
Retrieved
September 25, 2026

Open source

22. NYC Stormwater Flood Map: Extreme stormwater flood with 2080 sea level rise
Dataset · NYC Department of Environmental Protection, via NYC Department of City Planning
As of
September 8, 2025
Retrieved
September 25, 2026

Open source

23. NYC Stormwater Flood Map: Extreme stormwater flood with 2080 sea level rise: area of each lot in each category
Dataset · NYC Department of Environmental Protection, via NYC Department of City Planning
As of
September 8, 2025
Retrieved
September 25, 2026

Open source

24. Zoning Resolution § 23-731
Zoning Resolution · NYC Department of City Planning
Where
Sky exposure plane buildings: applicability
As of
September 10, 2026

The optional provisions for sky exposure plane buildings set forth in Section 23-73, inclusive, may be applied to zoning lots in R6 through R10 Districts without a letter suffix, except that such alternative provisions shall not apply to: zoning lots in R6-1, R6-2, R7-3 and R9-1 Districts; zoning lots in R8 Districts without a letter suffix in the portion of Community District 9 in the Borough of Manhattan located north of West 125th Street; or zoning lots located in the Limited Height Districts.

Open source

25. Zoning Resolution § 23-732
Zoning Resolution · NYC Department of City Planning
Where
Sky exposure plane buildings: maximum floor area ratio by height factor
As of
September 10, 2026

Where elected, such floor area ratio shall supersede the floor area ratio provisions of Section 23-22, and apply to all residences, including qualifying affordable housing or qualifying senior housing. … 14 | 34.0 | 2.43 | 22.0 | 3.44 | 9.8 | 5.92 | 6.2 | 7.52 … 17 | 35.5 | 2.42 | 23.5 | 3.40 | 10.7 | 6.02 | 7.4 | 7.52

Open source

26. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027
Document · NYC Department of City Planning
Where
PDF p. 36
Retrieved
September 23, 2026

Open source

27. FY2027 Register of Community Board Budget Requests (Adopted Budget), Brooklyn Community Board 2 FY2027 Adopted
Document · NYC Office of Management and Budget
Where
Agency response
As of
June 30, 2026

Open source

28. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027
Document · NYC Department of City Planning
Where
PDF p. 43
Retrieved
September 23, 2026

Open source

29. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027
Document · NYC Department of City Planning
Where
PDF p. 41
Retrieved
September 23, 2026

Open source

30. FY2027 Statement of Community District Needs and Community Board Budget Requests, Brooklyn Community Board 2 FY2027
Document · NYC Department of City Planning
Where
PDF p. 40
Retrieved
September 23, 2026

Open source

31. MTA Subway Stations
Dataset · Metropolitan Transportation Authority
As of
September 25, 2026
Retrieved
September 25, 2026

Open source

32. Digital City Map street centerlines
Dataset · NYC Department of City Planning
As of
December 1, 2025
Retrieved
September 25, 2026

Open source

33. New York City Charter Sec. 197-c (Uniform land use review procedure)
Document
Where
Sec. 197-c(a)(8) and (a)(10)

(8) Housing and urban renewal plans and projects pursuant to city, state and federal housing laws; ... (10) Sale, lease (other than the lease of office space), exchange, or other disposition of the real property of the city

Open source

34. NYC Charter Sec. 384 (Disposal of property of the city)
Document
Where
Sec. 384(a)

No real property of the city may be sold, leased, exchanged or otherwise disposed of except with the approval of the mayor and as may be provided by law unless such power is expressly vested by law in another agency.

Open source

35. CEQR Technical Manual, Chapter 2 (December 2025 edition)
Document
Where
PDF p. 1 (printed p. 2-1)

CEQR requires all city agencies to determine whether discretionary actions they directly approve, fund, or undertake may significantly and adversely affect the environment.

Open source

36. Zoning Resolution 11-15 (Environmental Requirements)
Document
Where
ZR 11-15(a); last amended 2012-03-28

Prior to issuing a building permit or temporary or final certificate of occupancy ... on a tax lot that has an (E) designation or an environmental restrictive declaration related to hazardous materials, noise or air quality, the Department of Buildings (DOB) shall be furnished with a notice issued by OER stating that OER does not object

Open source

37. HPD Design Guidelines for New Construction 2026
Document
Where
PDF p. 13, Secs. 1.1.1 and 1.1.4

1.1.1 Avoid excessive excavation. Particularly in areas with unknown subsurface conditions, and where rock or high-water tables are prevalent, proposed cellars may have to be reduced, relocated, or even eliminated.

Open source

38. Deed Restriction Database (NYC Open Data rfu7-paqe)
Document
Where
dataset description

A searchable electronic database of all real property upon which a deed restriction was imposed by the Department of Citywide Administrative Services, pursuant to Local Law 176 of 2016.

Open source

39. Handbook on the Alienation and Conversion of Municipal Parkland (NYS OPRHP, revised 2017-09-01)
Document
Where
PDF p. 3, 'Parkland Alienation'

In order to convey parkland away, or to use parkland for another purpose, a municipality must receive prior authorization from the State in the form of legislation enacted by the New York State Legislature and approved by the Governor.

Open source

40. City Owned and Leased Property (COLP), NYC Open Data fn4k-qyk2
Document
Where
dataset description (version 20260430)

City Owned and Leased Properties (COLP) is published by the Department of City Planning (DCP) as required by chapter 204 of the City Charter. It includes the location and current use of all City-owned and leased properties.

Open source

41. NY General City Law Sec. 35
Document
Where
GCL 35

For the purpose of preserving the integrity of such official map or plan no permit shall hereafter be issued for any building in the bed of any street or highway shown or laid out on such map or plan

Open source

42. NY General City Law Sec. 36
Document
Where
GCL 36

No permit for the erection of any building shall be issued unless a street or highway giving access to such proposed structure has been duly placed on the official map or plan

Open source

43. LPC - Applications page
Document
Where
page text

The Landmarks Preservation Commission (LPC) helps preserve the City's designated landmark properties by regulating changes made to these buildings and sites.

Open source

44. 2022 NYC Building Code, Appendix G (as amended by Local Law 77 of 2023)
Document
Where
PDF p. 1, Sec. G102.1

This appendix, in conjunction with the New York City Construction Codes, provides minimum requirements for development located, in whole or in part, in special flood hazard areas and shaded X-Zones within the jurisdiction of New York City

Open source

45. Zoning Resolution 61-21 (Restriction on Highest Projection of Building or Structure)
Document
Where
ZR 61-21; 61-11 designates JFK, LaGuardia and U.S. Naval Air Station (Floyd Bennett Field)

the highest projection of any building or other structure hereafter constructed ... shall not penetrate: (a) the approach surfaces, the transitional surfaces, the horizontal surface, or the conical surface, whichever is more restrictive, within the Airport Approach District of the flight obstruction area

Open source

46. HPD ELLA Term Sheet (updated 2020-03-10)
Document
Where
PDF p. 4

Projects funded with Federal funds require compliance with Section 3 new hires and Davis Bacon prevailing wages, as applicable.

Open source

47. CPC report C 260071 HAM (1727 Amsterdam Avenue)
Document
Where
PDF p. 8

while CHO increased the maximum floor area permitted on the project site, the project sponsor does not intend to take advantage of the additional floor area.

Open source

48. Zoning districts (NYZD)
Dataset · NYC Department of City Planning
As of
August 17, 2026
Retrieved
September 25, 2026

Open source