Alteration filingSep 3
DOB filing M01422296-S1
Alteration filing at 421 West 21 Street
Approved6 proposed stories
Open filing Building record · BIN 1012629
421 West 21 Street
421 West 21 Street, Manhattan, NY 10011
A consolidated, filing-by-filing view of DOB records matched to this building identifier. The current snapshot links 2 independently sourced records, including 2 that are not recorded as completed, closed or withdrawn.
newyorkdailyStreet Futures
BUILDING RECORD · BIN 1012629
421 West 21 Street
Chelsea-Hudson Yards, Manhattan
A consolidated public-record view · updated Sep 3, 2026
- DOB filings
- 2
- Active-status
- 2
- Recorded addresses
- 1
A building-level summary of matched filings, active-status records and published identifiers.
Matched filings2
Open or active-status records2
First included filingAug 4, 2026
Latest recorded changeSep 3, 2026
The lot
What is already here?
The lot holds a 6-story elevator apartment building built in 1938, with 36 homes, on a 6,750 sq ft lot.
- Floors 2–6Homes36 homes are recorded on this lot — about 7 homes to a floor. The city does not publish which floor any of them is on.
- Floor 1Street levelStreet level. The lot is recorded as elevator apartments.
- Street levelElevator apartments
- Homes36 recorded on the lot
- Above the southern skylineFrom about floor 13 — the tallest thing within 60 m to the south is 36.8 m
- Built
- 1938
- Last altered
- 1989
- Floors
- 6
- Residential units
- 36
- Building type
- Elevator apartment building
- Land use
- Elevator apartments
- Zoning district
- R7B
- Lot area
- 6,750 sq ft
- Building area
- 26,800 sq ft
- Historic district
- Chelsea Historic District
What it sold for
2 apartments on this tax block changed hands in the year the city last published, at a median of $1,520,000.
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
CHELSEA SQUARE NORTH INC
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 9, 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 3 open notices on record for this building, out of 38 notices on file; the most recent was issued Feb 5, 2018.
- Landmark
Issued Feb 5, 2018
- Landmark
Issued Feb 5, 2018
- Elevator
Issued Oct 22, 2002
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 14, 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 1012629. They should not be read as a single construction project unless the underlying filings say so.
The matched set includes 2 alteration filing. Its latest status categories are 2 approved. Each filing page preserves its own status, dates, scope and source identifier.
- First included filing
- Aug 4, 2026
- Latest recorded change
- Sep 3, 2026
- Highest proposed story count
- 6 stories
- Highest proposed unit count
- 36 dwelling units
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 2 matched filings, in the order it was recorded. A date marks what entered the public record, not what happened on site.
- Alteration filed01
Temporary pipe scaffold as per drawings. scaffold shall comply with ch #33 of the NYC bc. no change in use, occupancy or egress under this application. Filing M01422296-S1.
- Alteration filed02
Heavy duty sidewalk shed during exterior repairs filed under application # m01349874, filed sep. sidewalk shed shall comply with ch #33 of the NYC bc. no change in use, occupancy or egress under this application. Filing M01422296-I1.
- Alteration approved03
Filing M01422296-S1 reached an approved status.
- Alteration approved04
Filing M01422296-I1 reached an approved status.
- Permit recorded for alteration05
DOB lists a first permit date for M01422296-S1. That is not by itself confirmation of activity on site.
- Alteration now approved06
The latest status recorded for M01422296-S1 is “Permit Entire.”
- Permit recorded for alteration07
DOB lists a first permit date for M01422296-I1. That is not by itself confirmation of activity on site.
- Alteration now approved08
The latest status recorded for M01422296-I1 is “Permit Entire.”