Alteration filingSep 17
DOB filing M01320412-P5
Alteration filing at 418 West 21 Street
Approved5 proposed stories
Open filing Building record · BIN 1083573
418 West 21 Street
418 West 21 Street, Manhattan, NY 10011
A consolidated, filing-by-filing view of DOB records matched to this building identifier. The current snapshot links 5 independently sourced records, including 5 that are not recorded as completed, closed or withdrawn.
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BUILDING RECORD · BIN 1083573
418 West 21 Street
Chelsea-Hudson Yards, Manhattan
A consolidated public-record view · updated Sep 17, 2026
- DOB filings
- 5
- Active-status
- 5
- Recorded addresses
- 2
A building-level summary of matched filings, active-status records and published identifiers.
Matched filings5
Open or active-status records5
First included filingDec 4, 2025
Latest recorded changeSep 17, 2026
The lot
What is already here?
The lot holds a 6-story educational building built in 1931, on a 77,773 sq ft lot.
- Floors 2–6Nothing on record
- Floor 1Street levelStreet level. The lot is recorded as public facilities and institutions.
- Street levelPublic facilities and institutions
- Above the southern skylineFrom about floor 13 — the tallest thing within 60 m to the south is 36.8 m
- Built
- 1931
- Floors
- 6
- Residential units
- 0
- Building type
- Educational building
- Land use
- Public facilities and institutions
- Zoning district
- R7B
- Lot area
- 77,773 sq ft
- Building area
- 133,885 sq ft
- Historic district
- Chelsea Historic District
The apartments
42 condominium apartments are assessed on this block, and the typical one is 2,035 sq ft (189 m²). They run from 111 to 352 m².
The city values the typical one at $817,391. That is the Department of Finance’s market valuation for tax, not an asking price and not a sale.
What it sold for
5 apartments on this tax block changed hands in the year the city last published, at a median of $4,100,000, from 1,950,000 to 5,600,000.
Recorded sale prices from the Department of Finance’s rolling file, covering the year to Aug 31, 2026. Transfers under $10,000 are left out: New York records deed transfers between relatives at a dollar, and those are not sales. No apartment number and no name is carried from either side.
Owner of record
4 CHELSEA SQUARE, LLC
As the assessment roll records it. Only owners that read as a company are shown here; where the roll names an individual, nothing is published.
Lot facts come from NYC Department of City Planning, Primary Land Use Tax Lot Output (PLUTO) (64uk-42ks), accessed Sep 20, 2026. They describe the tax lot, not any single filing. When the rest of New York went up
Violation record
Are there open violations here?
The Department of Buildings has 35 open notices on record for this building, out of 98 notices on file; the most recent was issued Jun 23, 2024.
- Failure to submit
Issued Jun 23, 2024 — FAILURE TO SUBMIT AN EER PER AD. CODE SEC. 28-308.4 - MULTIPLE YEARS (2023)
- Failure to
Issued May 2, 2023 — FAILURE TO FILE BENCHMARKING REPORT OF ENERGY USE AS PER AD. CODE SEC. 28-309.4
- Failure to submit
Issued Apr 22, 2023 — FAILURE TO SUBMIT AN EER PER AD. CODE SEC. 28-308.4 - MULTIPLE YEARS (2022)
32 further open notices are on file. Open the source dataset for the full list.
Open means the agency has not recorded a resolution, which is not the same as the problem still existing. What a violation is, and what it is not. From NYC Department of Buildings, DOB Violations (3h2n-5cm9), accessed Sep 21, 2026.
What is recorded here
Multiple filings, one stable building identifier.
New York City's Building Identification Number helps connect filings that may use different application numbers or describe different scopes of work. The records below are grouped because they publish BIN 1083573. They should not be read as a single construction project unless the underlying filings say so.
The matched set includes 5 alteration filing. Its latest status categories are 4 approved, 1 under review. Each filing page preserves its own status, dates, scope and source identifier.
- First included filing
- Dec 4, 2025
- Latest recorded change
- Sep 17, 2026
- Highest proposed story count
- 5 stories
- Highest proposed unit count
- Not stated
Highest recorded values may come from different filings and must not be combined into one proposed project. Open the individual filings below for their exact scope. Values outside the publication's conservative data-quality bounds are withheld pending source review.
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Recorded history
What has happened at this address?
Every dated event the city has published for this building, from all 5 matched filings, in the order it was recorded. A date marks what entered the public record, not what happened on site.
- Alteration filed01
Seabury hall - removal and installation of interior partitons and finishes. new elevator shaft walls. no change in use, egress or occupancy. Filing M01320412-I1.
- Alteration filed02
Seabury hall - structural work including steel framing, slab on metal deck, and cmu walls to support a proposed elevator shaft and mechanical openings. additional work inthe attic includes metal grating for maintenance access. Filing M01320412-S1.
- Alteration approved03
Filing M01320412-I1 reached an approved status.
- Alteration approved04
Filing M01320412-S1 reached an approved status.
- Permit recorded for alteration05
DOB lists a first permit date for M01320412-I1. That is not by itself confirmation of activity on site.
- Permit recorded for alteration06
DOB lists a first permit date for M01320412-S1. That is not by itself confirmation of activity on site.
- Alteration filed07
Seabury hall - structural work including steel framing, slab on metal deck, and cmu walls to support a proposed elevator shaft and mechanical openings. additional work inthe attic includes metal grating for maintenance access. Filing M01320412-P2.
- Alteration filed08
Sherred hall - modifying the existing wood roof trusses to support proposed mechanical equipment. additional work includes wood framing, steel framing and lintels, and slab on metal deck. Filing M01320409-P2.
- Alteration filed09
Seabury hall - removal and installation of interior partitons and finishes. new elevator shaft walls. no change in use, egress or occupancy. Filing M01320412-P5.
- Alteration approved010
Filing M01320412-P5 reached an approved status.
- Alteration now approved011
The latest status recorded for M01320412-P5 is “Approved.”
- Alteration approved012
Filing M01320412-P2 reached an approved status.
- Alteration now approved013
The latest status recorded for M01320412-P2 is “Approved.”
- Alteration now under review014
The latest status recorded for M01320409-P2 is “Objections.”
- Alteration now approved015
The latest status recorded for M01320412-I1 is “Permit Entire.”
- Alteration now approved016
The latest status recorded for M01320412-S1 is “Permit Entire.”