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NYC DOB record · B00437895-I1

9 Willoughby Avenue

9 Willoughby Avenue, Brooklyn, NY 11205

Alteration filing in Fort Greene, Brooklyn. The latest DOB status is permit entire.

DOB has issued the permit covering the full scope of this filing, so the work is cleared to proceed.

ApprovedAlteration filing

NYC Department of Buildings · w9ak-ipjd · accessed Aug 31, 2026 · Verify the source row

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9 Willoughby Avenue record graphic showing the DOB filing status and stated proposal scale
Filing data portrait

A page-specific reading of the filing status, location and stated scale. Values are drawn from the cited DOB record.

Address record at a glance

What is filed at this address?

NYC DOB lists filing B00437895-I1 as a alteration filing at 9 Willoughby Avenue, Brooklyn, NY 11205. Its latest published status category is Approved, dated Dec 5, 2025. The filing records 5 proposed dwelling units.

A filing or approval does not by itself confirm that work is underway. Proposed details may change in later DOB records.
Filing type
Alteration filing
Latest status
Approved
Latest status date
Dec 5, 2025
Proposed scale
5 proposed dwelling units
Complete building dossierView all 4 filings associated with BIN 3430189
FiledFeb 23, 2021
Current recordApproved
Proposed scale5 units
Recorded cost$5,000

What the filing says

A public-record reading of the proposed work.

Filing herewith mechanical work for the building at the address listed. includes new vrf system(s), boiler, and kitchen, toilet & laundry exhaust systems. natural ventilation provided, refer to ot application drawings (architectural).

Street Futures classifies this record as a alteration filing based on the filing type and work flags published by the Department of Buildings. This classification helps organize the map; it does not add scope that is absent from the DOB record.

The lot this filing sits on

What is already here?

The lot holds a 4-story walk-up apartment building built in 1899, with 5 homes, on a 2,425 sq ft lot.

Built
1899
Last altered
2022
Floors
4
Residential units
5
Building type
Walk-up apartment building
Land use
Walk-up apartments
Zoning district
R6B
Lot area
2,425 sq ft
Building area
6,355 sq ft
Historic district
Fort Greene Historic District

Lot facts come from NYC Department of City Planning, Primary Land Use Tax Lot Output (PLUTO) (64uk-42ks), accessed Sep 1, 2026. They describe the tax lot, not this filing.

Recorded timeline

Dates published by the Department of Buildings.

  1. Application filed

    DOB received filing B00437895-I1.

    01
  2. Application approved

    The application reached an approved status in the DOB record.

    02
  3. First permit date recorded

    DOB lists a first permit date. This does not by itself confirm current construction activity.

    03
  4. Current status updated

    The latest recorded filing status is “Permit Entire.”

    04

Scope and identifiers

The details used to match this filing.

DOB filing number
B00437895-I1
BBL
3020720001
Review type
Standard Plan Examination
Existing stories
Not recorded
Proposed stories
Not recorded
Existing dwelling units
Not recorded
Proposed dwelling units
5

Nearby records

Other verified filings in this part of the city.