21 Montrose Avenue

21 Montrose Avenue in Williamsburg, Brooklyn, has 9 open HPD violations, and 34 of 30 units are rent-stabilized, as of Oct 26, 2026. StreetSpy grade: B (87/100).

Multi-family elevator · 30 units · Built 2008

StreetSpy grade: B (Good, 87/100)

• 9 open housing violations, none in the most serious class.
• The owner's bedbug filings report no infested units in the last 3 years.
• The other 2 buildings registered to this head officer are all graded C or better.
• 34 of 30 units are rent-stabilized; 29 on the 2007 tax bill.

Fewer open violations per unit than 5 in 10 Brooklyn buildings this size.

• Repairs: Low (9 open), records as of Oct 26, 2026
• Heat and hot water: 1 complaint, 12 mo, records as of Oct 25, 2026
• Pests: Clear (Owner reported none, 3 yr), records as of Oct 28, 2026
• Safety: Clear (No open DOB violations), records as of Oct 26, 2026
• Registration: Expired Sep 1, 2025, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

9 open violations: 0 class C (immediately hazardous), 1 class B, 8 class A. 2 issued in the last 12 months. 16 on record. Oldest open violation issued 2021-10-12. Newest violation issued 2026-09-14.

HPD recorded no violation closed here in the last 12 months.

• Class B: Leak or water damage, ceiling, kitchen, 5th floor. , 2027 HMC: PROPERLY REPAIR THE SOURCE AND ABATE THE EVIDENCE OF A WATER LEAK AT CEILING IN THE KITCHEN LOCATED AT APT 503, 5th STORY, 1st APARTMENT FROM SOUTH AT WEST (apt 503), issued 2021-10-12. HPD violation 14611997
• Class A: Damaged plaster or paint (entrance). POST SIGN ON WALL OF ENTRANCE STORY BEARING NAME, ADDRESS INCLUDING APARTMENT NUMBER IF ANY, AND TELEPHONE NUMBER OF SUPERINTENDENT, JANITOR OR HOUSEKEEPER., issued 2026-09-14. HPD violation 19212982
• Class A: Bedbugs. (A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS., issued 2026-05-08. HPD violation 18917164
• Class A: Damaged plaster or paint (hallway). POST AND MAINTAIN A PROPER SIGN ON WALL OF ENTRANCE STORY SHOWING THE REGISTRATION NUMBER ASSIGNED BY THE DEPARTMENT AND THE ADDRESS OF THE BUILDING. AT PUBLIC HALL, 1st STORY, issued 2024-12-31. HPD violation 17586326
• Class A: Missing or broken smoke / CO detector. HMC: POST A PROPER NOTICE OF CARBON MONOXIDE DETECTING DEVICE REQUIREMENTS, IN A FORM APPROVED BY THE COMMISSIONER, IN A COMMON AREA OF A CLASS A MULTIPLE DWELLING NEAR INSPECTION CERTIFICATE OR PROVIDE NOTICE TO TENANTS IN A PRIVATE DWELLING., issued 2024-12-31. HPD violation 17586327
• Class A: Damaged plaster or paint (entrance). ADMIN. CODE: POST AND MAINTAIN A PROPER NOTICE ON WALL OF THE ENTRANCE STORY IN ENGLISH AND SPANISH ON THE AVAILABILITY OF THE AGENCYS HOUSING INFORMATION GUIDE. A SAMPLE NOTICE CAN BE FOUND AT WWW.NYC.GOV/HPD., issued 2024-12-31. HPD violation 17586328
• Class A: Gas defect. HMC: POST, IN A FORM APPROVED BY THE COMMISSIONER, AND MAINTAIN A NOTICE IN A COMMON AREA OF THE BUILDING REGARDING THE PROCEDURES THAT SHOULD BE FOLLOWED WHEN A GAS LEAK IS SUSPECTED, issued 2024-12-31. HPD violation 17586329
• Class A: Floor or stair defect (hallway). , M/D LAW AND DEPT. RULES AND REGS. PROVIDE A COMPLETED CERTIFICATE OF INSPECTION VISITS IN A PROPER FRAME AT OR NEAR MAILBOXES, BOTTOM EDGE OF FRAME BETWEEN 48-62 INCHES ABOVE FLOOR MISSING AT PUBLIC HALL, 1st STORY, issued 2024-12-31. HPD violation 17586324

311 housing complaints

1 in the last 12 months, 4 in 5 years. Most common: Heat/Hot Water (1).

Bedbugs

The owner reported 0 infested units in the last 3 years of filings. HPD's bedbug filings are self-reported by the owner once a year; HPD does not inspect to confirm them.

• 2026: No bedbug filing on record for this year
• 2025: Owner reported 0 infested units
• 2024: No bedbug filing on record for this year
• 2023: Owner reported 0 infested units
• 2022: No bedbug filing on record for this year
• 2021: Owner reported 0 infested units

Buildings department (DOB)

No open DOB violations. 0 DOB violations on record. Check on DOB BIS.

Evictions and housing court

0 executed evictions in the last 3 years (1 on record). 0 open HPD cases; 0 harassment findings.

Rent stabilization

34 of 30 units rent-stabilized as of 2024. Stabilized renewals: 0% for one year and 0% for two years under RGB Order #58 (Oct 1, 2026 to Sep 30, 2027).

Rent-stabilized units on city tax bills: 34 in 2024, 29 in 2007. Source: DOF tax bills for 2007 and 2024; years with no bill on file are left out.

Owner and management

Owner: JIAN YE, LLC. Head officer: MOSHE BLUM. Managing agent: MOSHE BLUM. This owner has 3 buildings on record, 0 graded D or F. See the full portfolio.

Last HPD registration Oct 16, 2024. HPD registration expired Sep 1, 2025 and had not been renewed as of Oct 3, 2026. Buildings with 3+ units must register with HPD every year.

Tax lot and city IDs

BBL 3030490043, HPD building ID 902238. HPD Online, ACRIS, DOB BIS.

Nearest subway

• Broadway (G), 2 min walk
• Hewes St (M, J), 4 min walk
• Lorimer St (M, J), 5 min walk

How the grade is calculated

Sources: NYC HPD Housing Maintenance Code Violations, NYC 311 Service Requests, NYC HPD Bedbug Reporting, NYC Marshal Evictions (DOI), NYC HPD Housing Litigations, NYC DOB Violations, NYC DOF tax bills (via JustFix Who Owns What portfolio API, v2), NYC HPD Property Registration. Methodology. Report generated 2026-10-28.