12 Martense Street

12 Martense Street in Flatbush, Brooklyn, has 42 open HPD violations, 16 of them class C, and no rent-stabilized units are on its tax bill, as of Oct 26, 2026. StreetSpy grade: F (25/100).

Multi-family walk-up · 20 units · Built 1925

StreetSpy grade: F (Severe, 25/100)

• 16 immediately hazardous violations open (the class that covers no heat, pests, lead paint and similar).
• 2 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a.
• 13 housing complaints to 311 in the last 12 months.
• No rent-stabilized units on the tax bill. Increases aren't capped by stabilization, though Good Cause Eviction may still limit them.

More open violations per unit than 8 in 10 Brooklyn buildings this size.

• Repairs: High (42 open, 16 class C), 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 (1 open DOB violation), records as of Oct 26, 2026
• Registration: Renewal not yet in city data, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

42 open violations: 16 class C (immediately hazardous), 21 class B, 5 class A. 9 issued in the last 12 months. 381 on record. Oldest open violation issued 2006-09-19. Newest violation issued 2026-08-19.

0 closed in the last 90 days. Median 1,374 days from issue to close for the 13 violations closed in the last 12 months.

2 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a. Section 302-a; NY Courts guidance on getting repairs.

• Class C: Self-closing door not working, 2nd floor. , 27-2007, 27-2041.1 HMC, §238, § 309; § 107 (2) ( C) MDL AND 28 RCNY §25-171: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE LATCH SET IN THE ENTRANCE LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION ''north'' (apt 2B), issued 2026-08-19. HPD violation 19145944
• Class C: Self-closing door not working (hallway). , 27-2007, 27-2041.1 HMC, §238, § 309; § 107 (2) ( C) MDL AND 28 RCNY §25-171: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE LATCH SET AT VESTIBULE DOOR AT PUBLIC HALL, 1st STORY, issued 2026-08-19. HPD violation 19145936
• Class C: Plumbing defect, bathroom, 2nd floor. REMOVE ALL OBSTRUCTIONS AND REPAIR ALL DEFECTS IN WASTELINE AT WATER CLOSET IN THE BATHROOM LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION ''north'' (apt 2B), issued 2026-08-19. HPD violation 19145938
• Class C: Self-closing door not working, 2nd floor. , 27-2007, 27-2041.1 HMC, §238, § 309; § 107 (2) ( C) MDL AND 28 RCNY §25-171: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE HINGES IN THE ENTRANCE LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION AT NORTH (apt 2B), issued 2025-10-22. HPD violation 18321538
• Class C: Self-closing door not working, 2nd floor. , 27-2007, 27-2041.1 HMC: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE ... IN THE ENTRANCE LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION ''NORTH'' (apt 2B), issued 2021-08-18. HPD violation 14500569
• Class C: Self-closing door not working, 2nd floor. , 27-2007, 27-2041.1 HMC: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE ... IN THE ENTRANCE LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH (apt 2B), issued 2021-08-13. HPD violation 14493857
• Class C: Mold, bathroom, 3rd floor. HMC:TRACE AND REPAIR THE SOURCE AND ABATE THE NUISANCE CONSISTING OF MOLD ... AT CEILNG (APPROX 4 SQ FT), SOUTH WALL (APPROX 20 SQ FT) AND EAST WALL (APPROX 6 SQ FT) IN THE BATHROOM LOCATED AT APT 3B, 3rd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION AT NORTH (apt 3B), issued 2018-11-08. HPD violation 12743094
• Class C: Mold, ceiling, bathroom, 2nd floor. HMC:TRACE AND REPAIR THE SOURCE AND ABATE THE NUISANCE CONSISTING OF MOLD ... AT CEILING (APPROX 16 SQ FT), SOUTH WALL (APPROX 4 SQ FT) AND WEST WALL (APPROX 12 SQ FT) IN THE BATHROOM LOCATED AT APT 2B, 2nd STORY, 2nd APARTMENT FROM WEST AT NORTH , SECTION AT NORTH (apt 2B), issued 2018-11-08. HPD violation 12742990

311 housing complaints

13 in the last 12 months, 37 in 5 years. Most common: Paint/Plaster (4), Door/Window (3), Plumbing (3), Heat/Hot Water (1), Unsanitary Condition (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: Owner reported 0 infested units
• 2021: Owner reported 0 infested units

Buildings department (DOB)

1 open DOB violation. 3 DOB violations on record. Check on DOB BIS.

Evictions and housing court

4 executed evictions in the last 3 years (4 on record). 0 open HPD cases; 0 harassment findings.

Rent stabilization

No rent-stabilized units on the tax bill.

Owner and management

Owner: 12 martense holdings llc. Head officer: MINDY ELLMAN. Managing agent: howard H MANDEL. This owner has 3 buildings on record, 3 graded D or F. See the full portfolio.

Last HPD registration Aug 27, 2025. Registration on file through Sep 1, 2026; renewal not yet in the city's data.

Tax lot and city IDs

BBL 3050890012, HPD building ID 808797. HPD Online, ACRIS, DOB BIS.

Nearest subway

• Church Av (B, Q), 5 min walk
• Parkside Av (Q), 7 min walk
• Church Av (2, 5), 9 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.