Permit Record

Alteration Commercial

421 West 45 Street, Manhattan, NY 10036

ClassificationALMultifamily Alteration
Reliable valueNot in source
ContractorSiena Construction Ltd →
Permit record
Parties
Contractor
Siena Construction Ltd
Applicant
Trudy Swaby
Owner
45th Street Associates
Architect
Not in source
Engineer
Not in source
Contractor license
0037909
Building & lot · PLUTO
Building class
C4
Zoning district
R8
Lot area
2,510 sq ft
Year built
1910
Units (total)
11
Units (residential)
11
Units (commercial)
Not in source
Floor area
Not in source
Parcel & enrichment
Parcel APN
1010550022
Climate zone (IECC)
4A
Roof area (est.)
2,129 sq ft
HVAC tonnage (est.)
14 tons
Building type
R
Building subtype
Not in source
Geocode & dates
Coordinates
40.7607, -73.9921
Geocode confidence
95%
Geocode source
Not in source
Issued
Oct 30, 2025
Applied
Oct 30, 2025
Work class
Residential
Status
Current status
issued
Source status
ISSUED
Expired
Oct 7, 2026
Provenance
First seen by PermitCore
May 2, 2026 · 16:53 UTC
Last seen
Jul 17, 2026 · 02:36 UTC
Last changed
May 3, 2026 · 03:42 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

10 permits at this parcel (parcel 1010550022) · May 31, 2007 – Oct 30, 2025

  1. Oct 30, 2025This permitAlteration Commercial · IssuedSiena Construction Ltd
  2. Nov 18, 20131252692Alteration Commercial · IssuedRockway Fuel Oil CORP
  3. Nov 18, 2013legacy_jobs:2308698Alteration Residential · Finaled
  4. Nov 18, 20131246551Alteration Commercial · IssuedRockway Fuel Oil CORP
  5. Nov 18, 20131246526Alteration Commercial · IssuedRockway Fuel Oil CORP
  6. Jun 12, 20071973053MEP Plumbing · IssuedBhi INC.
  7. Jun 12, 2007legacy_jobs:604395Alteration Residential · Issued$40,000
  8. Jun 12, 2007legacy_jobs:579439Alteration Residential · Issued$40,000
  9. May 31, 20071967380Alteration Commercial · IssuedSiena Construction Ltd
  10. Date not in source3980416Alteration Commercial · Pending

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

Other permits by Siena Construction Ltd

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Developer details
Permit #
3993951
Canonical ID
1:3993951
Source permit ID
3993951
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