Permit Record

Alteration Commercial

20 Adelphi Street, Brooklyn, NY 11205

ClassificationAlteration
Reliable valueNot in source
ContractorProperly Organized Timber →
Permit record
Parties
Contractor
Properly Organized Timber
Applicant
Leonard Tyson
Owner
Home Owner
Architect
Not in source
Engineer
Not in source
Contractor license
0039665
Building & lot · PLUTO
Building class
G9
Zoning district
M1-2
Lot area
1,668 sq ft
Year built
1957
Units (total)
2
Units (residential)
1
Units (commercial)
Not in source
Floor area
Not in source
Parcel & enrichment
Parcel APN
3020310039
Climate zone (IECC)
4A
Roof area (est.)
3,327 sq ft
HVAC tonnage (est.)
3.5 tons
Building type
S
Building subtype
Not in source
Geocode & dates
Coordinates
40.6973, -73.9727
Geocode confidence
95%
Geocode source
Not in source
Issued
Oct 17, 2012
Applied
Oct 17, 2012
Work class
Not in source
Status
Current status
issued
Source status
ISSUED
Expired
Oct 5, 2013
Provenance
First seen by PermitCore
May 2, 2026 · 15:39 UTC
Last seen
Jul 17, 2026 · 17:49 UTC
Last changed
May 3, 2026 · 03:06 UTC

Open in New York City source →

Data-quality checks0 of 12 flagged

0 of 12 data-quality rules flagged anything on this permit.

Checks not flagged

  • Geocode out of bounds
  • Geocode is sentinel
  • Issued date in the future
  • Issued date parse bug
  • Issued date is placeholder
  • Commercial units is placeholder
  • Residential units out of bounds
  • Residential units is placeholder
  • Total units out of bounds
  • Total units is placeholder
  • Valuation out of bounds
  • Valuation is placeholder
Project timeline at this parcel

3 permits at this parcel (parcel 3020310039) · Feb 29, 2012 – Oct 17, 2012

  1. Oct 17, 2012This permitAlteration Commercial · IssuedProperly Organized Timber
  2. Feb 29, 20122524588Alteration Commercial · IssuedProperly Organized Timber
  3. Date not in sourcelegacy_jobs:1755021Alteration Commercial · Issued$30,000

Full permit history at this parcel · as of Jul 9, 2026.

Other permits by Properly Organized Timber

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Developer details
Permit #
2631681
Canonical ID
1:2631681
Source permit ID
2631681
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