634 Humboldt Street

634 Humboldt Street in Greenpoint, Brooklyn, has 8 open HPD violations, 1 of them class C, and 5 of 6 units are rent-stabilized, as of Oct 25, 2026. StreetSpy grade: D (59/100).

Multi-family walk-up · 6 units · Built 1931

StreetSpy grade: D (Poor, 59/100)

• 1 immediately hazardous violation open (the class that covers no heat, pests, lead paint and similar).
• The head officer on this registration is named on 3 buildings' registrations; 1 graded D or F.
• The owner's bedbug filings report no infested units in the last 3 years.
• 5 of 6 units are rent-stabilized; 6 on the 2007 tax bill.

More open violations per unit than 6 in 10 Brooklyn buildings this size.

• Repairs: Medium (8 open, 1 class C), records as of Oct 25, 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 27, 2026
• Safety: Clear (No open DOB violations), records as of Oct 23, 2026
• Registration: Renewal not yet in city data, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

8 open violations: 1 class C (immediately hazardous), 1 class B, 6 class A. 3 issued in the last 12 months. 19 on record. Oldest open violation issued 2026-09-18. Newest violation issued 2026-09-18.

1 closed in the last 90 days. Median 57 days from issue to close for the 2 violations closed in the last 12 months.

• Class C: No heat / heating defect (hallway). POST NOTICE, IN FORM APPROVED BY THE DEPARTMENT, STATING THE NAME AND LOCATION OF THE PERSON DESIGNATED BY THE OWNER TO HAVE KEY TO BUILDINGS HEATING SYSTEM SIGNAGE MISSING AT PUBLIC HALL, 1st STORY. HPD violation 19288938
• Class B: Door, lock or intercom defect (hallway). HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE LATCH SET AT VESTIBULE DOOR AT PUBLIC HALL, 1st STORY, issued 2026-09-18. HPD violation 19223580
• 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. HPD violation 19288933
• Class A: Missing or broken smoke / CO detector (hallway). (B)(5) HMC, § 12-01 RCNY POST A PROPER NOTICE OF SMOKE DETECTOR REQUIREMENTS, IN A FORM APPROVED BY THE COMMISSIONER, AT OR NEAR THE MAILBOX AT PUBLIC HALL, 1st STORY. HPD violation 19288929
• Class A: Damaged plaster or paint (hallway). 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. AT PUBLIC HALL, 1st STORY. HPD violation 19288922
• Class A: Gas defect (hallway). 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 AT PUBLIC HALL, 1st STORY. HPD violation 19288936
• 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 FRAME MISSING AT PUBLIC HALL, 1st STORY. HPD violation 19288920
• Class A: Missing or broken smoke / CO detector. (B)(5) HMC, § 12-06, 12-10 RCNY POST A PROPER NOTICE OF CARBON MONOXIDE DETECTING DEVICE REQUIREMENTS, IN A FORM APPROVED BY COMMISSIONER, IN A COMMON AREA OF A CLASS A MULTIPLE DWELLING NEAR INSPECTION CERTIFICATE OR PROVIDE NOTICE TO TENANTS IN PRIVATE DWELLINGS SIGNAGE MISSING. HPD violation 19288932

311 housing complaints

3 in the last 12 months, 9 in 5 years. Most common: Unsanitary Condition (2), 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: Owner reported 0 infested units
• 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 (0 on record). 0 open HPD cases; 0 harassment findings.

Rent stabilization

5 of 6 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: 5 in 2024, 6 in 2007. Source: DOF tax bills for 2007 and 2024; years with no bill on file are left out.

Owner and management

Owner: 634 Humboldt Str, LLC. Head officer: KRZYSZTOF ROSTEK. Managing agent: KRZYSZTOF ROSTEK. This owner has 3 buildings on record, 1 graded D or F. See the full portfolio.

Last HPD registration Jul 22, 2025. Registration on file through Sep 1, 2026; renewal not yet in the city's data.

Tax lot and city IDs

BBL 3026860057, HPD building ID 315078. HPD Online, ACRIS, DOB BIS.

Nearest subway

• Nassau Av (G), 7 min walk
• Graham Av (L), 12 min walk
• Lorimer St (L), 14 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 2026-10-27.