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 The current snapshot links 2 independently sourced records, including 2 that are not recorded as completed, closed or withdrawn.
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.
- 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
Lot facts come from NYC Department of City Planning, Primary Land Use Tax Lot Output (PLUTO) (64uk-42ks), accessed Sep 5, 2026. They describe the tax lot, not any single filing.
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
A violation is a notice the Department of Buildings recorded against the building. It is not a judgment, and many concern paperwork rather than safety. Open means the agency has not recorded a resolution, which is not the same as the problem still existing. From NYC Department of Buildings, DOB Violations (3h2n-5cm9), accessed Sep 5, 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.”