175 open HPD violations at this address, 57 of them class C — the immediately hazardous tier — on a 102-unit elevator apartment building in Brooklyn.
520 East 21st Street is a 102-unit building in Brooklyn, New York City (BBL 3051840006). This building is associated with Ditmas Flats LLC. Brix tracks 175 open HPD violations for this property, along with inspection history, DOB filings, tenant complaints, and rent stabilization status.
Built in 1951, this elevator apartment building sits in Brooklyn and is tracked by Brix using public NYC records from HPD, DOB, ACRIS, and 311.
Tenants have filed 820 HPD complaints about this building over the last five years, most often about heat/hot water.
What tenants have called the city about here over the last five years:
The most recent complaint on this building was filed October 14, 2026.
Conditions cited on open violations at this address:
The building last changed hands on March 30, 2015 for $26,500,000, according to recorded deeds.
Brix score: 0/100. View the Building Report on Brix.
See every NYC building owned by Ditmas Flats LLC on the landlord portfolio page.
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Unit 1L at 520 East 21st Street has 41 open violations.
Unit 1R at 520 East 21st Street has 21 open violations.
Unit C at 520 East 21st Street has 14 open violations.
Unit 1K at 520 East 21st Street has 12 open violations.
Unit 1H at 520 East 21st Street has 9 open violations.
Unit 2K at 520 East 21st Street has 8 open violations.
Unit 4S at 520 East 21st Street has 7 open violations.
Unit 4E at 520 East 21st Street has 6 open violations.
Unit 2D at 520 East 21st Street has 5 open violations.
Unit 2A at 520 East 21st Street has 5 open violations.
Unit 1J at 520 East 21st Street has 4 open violations.
Unit 2S at 520 East 21st Street has 3 open violations.
Unit 2O at 520 East 21st Street has 3 open violations.
Unit 5N at 520 East 21st Street has 2 open violations.
Unit 6P at 520 East 21st Street has 2 open violations.
Unit 2P at 520 East 21st Street has 2 open violations.
Unit 2H at 520 East 21st Street has 2 open violations.
Unit 1A at 520 East 21st Street has 1 open violation.
Unit 6L at 520 East 21st Street has 1 open violation.
Unit 3R at 520 East 21st Street has 1 open violation.
Unit 1O at 520 East 21st Street has 1 open violation.
Unit 3L at 520 East 21st Street has 1 open violation.
Unit 102 at 520 East 21st Street has no violations.
Unit 20 at 520 East 21st Street has no open violations (10 past violations).
Unit 10 at 520 East 21st Street has no open violations (2 past violations).
Unit 6A at 520 East 21st Street has no open violations (2 past violations).
Unit 6B at 520 East 21st Street has no open violations (27 past violations).
Unit 6C at 520 East 21st Street has no open violations (4 past violations).
Unit 6D at 520 East 21st Street has no open violations (2 past violations).
Unit 6H at 520 East 21st Street has no open violations (4 past violations).
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