How well maintained is this building?

There are 22 open HPD violations on record, including 20 Class C (the city's most serious category). That's higher than typical for the neighborhood (1 average per building).

How noisy is this building?

Neighbors filed 0 noise complaints with 311 in the past year — none on record for this building.

How responsive is management to problems?

Resolved violations at this building closed in about 880 days on average (NYC average is roughly 45 days). Open items are listed in the Safety & Violations section above.

What does it cost to live here?

We don't have current listings for this building. Typical asking rent in South Slope is about $3,688/month for a one-bedroom.

503 12th Street

South Slope·Brooklyn

🔴3 Pest Alerts

⚪Pre-War

Scroll for details

Violation & building data

Violation data updated Jul 1

Sources: NYC Department of Buildings, NYC Housing Preservation & Development +1 more

Building overview

Area Avg$3,687.51-bed neighbourhood

Value—needs listing data

Violations20 critical

BuildingWalk-up

Data as of Jul 1, 2026

Building Quality

How is this calculated?

0.0/ 10Significant Issues

Based on open violations, 311 complaint patterns, and amenities.

Unit Value

How is this calculated?

Limited data — verify with a tour.

Compared to typical rent for this neighborhood and bedroom count.

Highlights

What's great about this place

Pre-war character
Built in 1916
Quieter than average for the neighborhood
0 noise complaints in past year (vs 1 median)

Things to Know

Real considerations before you sign

Open critical violations
20 Class C (immediately hazardous)
Top complaint type at this building
20 heat complaints in past year
Significant issues across building data
See violation history below for details

How we pick these

Neighbourhood mapOpen in Google Maps

About this building

A 4-story building located in Park Slope, containing 34 residential units. Built in 1916.

Neighborhood

South Slope →

The neighborhood: South Slope

Brooklyn · 2,818 buildings tracked

Median asking rent: $3,688 1BR · $5,000 2BR

4th6thAvCulver

2 subway stations nearby

Full South Slope guide

Available Units

0 active

No past listings.

Past and off-market units will appear here when data is available.

Safety & Violations

Safety Record

Active Violations

Higher than typical for this neighborhood (22 vs 1 average per building).

Top issues

Lead Paint16
Pests3
Mold2

Severity Key

Class C: Immediately Hazardous (Major)
Class B: Hazardous (Moderate)
Class A: Non-Hazardous (Minor)

Show Critical Only (Class C)

Pests
ABATE THE INFESTATION CONSISTING OF MICE IN THE ENTIRE APARTMENT LOCATED AT APT C2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTH
Jun 24, 2026Class C
Pests
ABATE THE INFESTATION CONSISTING OF ROACHES IN THE ENTIRE APARTMENT LOCATED AT APT C2, 2nd STORY, 1st APARTMENT FROM WEST AT NORTH
Jun 24, 2026Class C
Lead Paint
CORRECT THE LEAD-BASED PAINT HAZARD - PAINT THAT TESTED POSITIVE FOR LEAD CONTENT AND THAT IS PEELING OR ON A DETERIORATED SUBSURFACE - USING WORK PRACTICES SET FORTH IN 28 RCNY §11-06(B)(2) NORTH WALL, 1st WINDOW FRAME FROM NORTH AT EAST WALL IN THE BATHROOM LOCATED AT APT 3B, 3rd STORY, 2nd APARTMENT FROM WEST AT NORTH
May 5, 2025Class C
Lead Paint
CORRECT THE LEAD-BASED PAINT HAZARD - PAINT THAT TESTED POSITIVE FOR LEAD CONTENT AND THAT IS PEELING OR ON A DETERIORATED SUBSURFACE - USING WORK PRACTICES SET FORTH IN 28 RCNY §11-06(B)(2) SOUTH WALL IN THE 4th ROOM FROM NORTH LOCATED AT APT 3B, 3rd STORY, 2nd APARTMENT FROM WEST AT NORTH
May 5, 2025Class C
Pests
ABATE THE INFESTATION CONSISTING OF MICE IN THE ENTIRE APARTMENT LOCATED AT APT 2D, 2nd STORY, 2nd APARTMENT FROM EAST AT SOUTH
May 1, 2025Class C

Market Value Estimate

Statistical estimate based on publicly available listing data. Not an appraisal. See disclaimer.Market data as of Jul 1, 2026.

Comp Matrix

Unit Type	This Bldg	Area Avg	Diff.
1 Bed	—	$3,687.5	—
2 Bed	—	$5,000	—
3+ Bed	—	$6,400	—

Value Verdict

Insufficient listing or market data to compute a verdict for this building.

Rent vs. Buy Analysis

No listing data available to estimate rent vs. buy.

Management & Operations

Management & Performance

Owner/Operator

503-9 12 ST LLC

Responsiveness Score

880days

Average time to resolve violations

Slower than NYC average (45 days)

We haven't verified this building's policies yet. Pet, utility, and leasing details appear here once we've reviewed the management company's official site — we only show policies we can source, never assumptions.

Living here — quick answers

Every answer comes from public records for this specific building — we skip questions we can't answer with data.

How well maintained is this building?: There are 22 open HPD violations on record, including 20 Class C (the city's most serious category). That's higher than typical for the neighborhood (1 average per building).
How noisy is this building?: Neighbors filed 0 noise complaints with 311 in the past year — none on record for this building.
How responsive is management to problems?: Resolved violations at this building closed in about 880 days on average (NYC average is roughly 45 days). Open items are listed in the Safety & Violations section above.
What does it cost to live here?: We don't have current listings for this building. Typical asking rent in South Slope is about $3,688/month for a one-bedroom.

Similar buildings in South Slope