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307 12 Street, Brooklyn is a residential building in Park Slope, Brooklyn, New York City. As of June 8, 2026, this building has 3 open HPD violations: 1 Class A, 1 Class B, and 1 Class C (immediately hazardous). In the last 12 months, 120 complaints have been filed against this building via NYC 311. The most common complaint type is HEAT/HOT WATER. The building's overall risk rating is CRITICAL RISK. Data source: NYC Open Data, updated daily. Last verified: June 8, 2026.

307 12 Street, Brooklyn

📍 Park Slope, Brooklyn 🔨 Built 1912 🏢 25 units 🏷️ Class C1
Residential
CRITICAL RISK

Safety Rating: Immediately hazardous — Immediately hazardous violations — serious concerns.

311 Complaint Summary

1
Last 30 Days
90
Last 90 Days
120
Last 365 Days
⚠️ Complaints are up 891% compared to the previous 6 months.
Complaint Types (Last 12 Months)
HEAT/HOT WATER
45(39%)
UNSANITARY CONDITION
22(19%)
PLUMBING
15(13%)
PAINT/PLASTER
11(10%)
DOOR/WINDOW
8(7%)
FLOORING/STAIRS
6(5%)
GENERAL
4(3%)
ELECTRIC
4(3%)
📅 Monthly Activity Heatmap (Last 12 Months)
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HPD Housing Violations

1 Class A
1 Class B
1 Class C
Class A § 27-2005 ADM CODE PAINT METAL IN ACCORDANCE WITH DEPT. REGULATION THE 1st RISER FROM WEST AT NORTH WALL IN THE 5th ROOM FROM EAST LOCATED AT APT 5, 1st STORY, 2nd APARTMENT FROM WEST AT NORTH
2024-01-21 ▼

Violation ID: #16611768

Current Status: Open

Date Issued: 2024-01-21T00:00:00.000

Description: § 27-2005 ADM CODE PAINT METAL IN ACCORDANCE WITH DEPT. REGULATION THE 1st RISER FROM WEST AT NORTH WALL IN THE 5th ROOM FROM EAST LOCATED AT APT 5, 1st STORY, 2nd APARTMENT FROM WEST AT NORTH

Class B § 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... GREATER THAN 10 SQ FT AT CEILING IN THE BATHROOM LOCATED AT APT 23, 5th STORY, 2nd APARTMENT FROM NORTH AT EAST
2026-02-14 ▼

Violation ID: #18642657

Current Status: Open

Date Issued: 2026-02-14T00:00:00.000

Description: § 27-2017.3 HMC: TRACE AND REPAIR THE SOURCE AND ABATE THE VISIBLE MOLD CONDITION... GREATER THAN 10 SQ FT AT CEILING IN THE BATHROOM LOCATED AT APT 23, 5th STORY, 2nd APARTMENT FROM NORTH AT EAST

Class C HMC ADM CODE: § 27-2017.4 ABATE THE INFESTATION CONSISTING OF RODENTS RATS DROPPINGS IN THE ENTIRE APARTMENT LOCATED AT APT 14, 3rd STORY, 1st APARTMENT FROM WEST AT NORTH
2025-01-16 ▼

Violation ID: #17628673

Current Status: Open

Date Issued: 2025-01-16T00:00:00.000

Description: HMC ADM CODE: § 27-2017.4 ABATE THE INFESTATION CONSISTING OF RODENTS RATS DROPPINGS IN THE ENTIRE APARTMENT LOCATED AT APT 14, 3rd STORY, 1st APARTMENT FROM WEST AT NORTH

⚠️ What does Class C mean?

Class C violations are classified as immediately hazardous by the HPD (e.g. lack of heat or hot water, active mold, severe rodent infestations, lead-based paint, or carbon monoxide detector issues). Landlords are legally required to resolve these immediately.

Violation History & Landlord Accountability

A Violation Severity
3 Open Violations
1 Class A
1 Class B
1 Class C

Few or no Class C violations on record.

Score: 96.4/100 · Based on current open violations. Higher Class C violations = lower score.

First violation on record: 2024-01-21 · Most recent: 2026-02-14

A Few/no Class C  ·  B Limited Class C  ·  C Multiple Class C  ·  D Significant  ·  F High hazard load

Neighborhood Comparison

How 307 12 Street, Brooklyn compares to other tracked buildings in Park Slope in the last 12 months.

0
Average building in Park Slope
120
This building
1
NYC Average

Nearby Buildings

Top complained-about buildings in the same neighborhood (Park Slope) in the last 12 months.

Address Complaints Violations Risk Score Actions
515 6 AVENUE, BROOKLYN 439 17 CRITICAL View →
38 SIXTH AVENUE, BROOKLYN 271 79 CRITICAL View →
89 VISITATION PLACE, BROOKLYN 224 190 CRITICAL View →
230 ST JOHNS PLACE, BROOKLYN 211 47 CRITICAL View →
110 4 AVENUE, BROOKLYN 137 2 CRITICAL View →

Data Disclaimer: All compliance data on this page is synced directly from municipal reports published via NYC Open Data. Complaint counts and HPD housing violations are updated daily. Building characteristics (built year, unit count, and building class) are derived from the NYC Department of City Planning's PLUTO database.

Data last updated: June 8, 2026 · Source: NYC Open Data

⚠️ Serious Concerns Found

This building has 120 complaints and 1 Class C (immediately hazardous) violations on record in the last 12 months. Review the full violation list carefully before signing any lease.

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About This Data

Complaint data is sourced from the NYC 311 Service Requests dataset (NYC Open Data). Violation data is from the HPD Housing Maintenance Code Violations dataset. Building info is based on NYC PLUTO by NYC Department of City Planning.

All records are public-domain municipal data provided as-is. Updated daily. Last verified: June 8, 2026.