How well maintained is this building?

There are 76 open HPD violations on record, including 16 Class C (the city's most serious category).

Is this building rent-stabilized?

Yes — this building appears on the DHCR rent-stabilized building list. Ask the landlord to confirm whether a specific apartment is stabilized.

How noisy is this building?

Neighbors filed 2 noise complaints with 311 in the past year, above the neighborhood median of 1 among buildings with any noise complaints.

How responsive is management to problems?

Resolved violations at this building closed in about 1200 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 Gowanus is about $4,157/month for a one-bedroom.

639 Union Street

Gowanus·Brooklyn

🔴3 Pest Alerts

⚪Pre-War

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Violation & building data

Violation data updated 2 days ago

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

Building overview

Area Avg$4,156.51-bed neighbourhood

Value—needs listing data

Violations16 critical

BuildingWalk-up

Data as of Sep 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 1931

Things to Know

Real considerations before you sign

Open critical violations
16 Class C (immediately hazardous)
Higher noise than typical for the neighborhood
2 noise complaints in past year (vs 1 median)
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 Carroll Gardens-Cobble Hill-Gowanus-Red Hook, containing 8 residential units. Built in 1931.

Neighborhood

Gowanus →

The neighborhood: Gowanus

Brooklyn · 3,023 buildings tracked

Median asking rent: $4,157 1BR · $5,998 2BR

6thAvCulver

1 subway station nearby

4 parks · 1.1 acres · incl. Ennis Playground

Full Gowanus 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

Open HPD violations on record for this building.

Top issues

Safety21
Window/Door15
Lead Paint11

Severity Key

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

Show Critical Only (Class C)

Safety
HMC: §238 MDL and 28 RCNY §25-171: REPLACE OR REPAIR THE SELF-CLOSING THE DOORS THAT IS MISSING OR DEFECTIVE HINGES AT DOOR. IN THE ENTRANCE LOCATED AT APT 1L, 1st STORY, 1st APARTMENT FROM WEST AT NORTH
Jul 21, 2026Class C
Water/Plumbing
OR REPLACE THE BROKEN OR DEFECTIVE LOWER SASH, INNER GLASS PANE AT 1ST WINDOW FROM WEST AT NORTH WALL. IN THE BATHROOM LOCATED AT APT 1L, 1st STORY, 1st APARTMENT FROM WEST AT NORTH
Jul 21, 2026Class C
Safety
C) MDL AND 28 RCNY §25-171: REPLACE OR REPAIR THE SELF-CLOSING DOORS THAT IS MISSING OR DEFECTIVE CELLAR ENTRANCE DOOR AT FRONT YARD
Jul 10, 2023Class C
Pests
APPROVED ONE-HOUR FIRE RESISTANCE RATED SELF-CLOSING DOOR AT ALL OPENINGS TO PUBLIC HALL OTHER THAN APT MAIN ENTRANCE DOOR FROM VESTIBULE DOOR, AT NORTH WALL, AT PUBLIC HALL, 1st STORY
Jun 16, 2023Class C
Pests
IN. CODE: ABATE THE NUISANCE CONSISTING OF ROACHES LOCATED AT APT 3L, 3rd STORY, 1st APARTMENT FROM WEST AT NORTH
Jan 30, 2019Class C

Market Value Estimate

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

Comp Matrix

Unit Type	This Bldg	Area Avg	Diff.
Studio	—	$3,429.75	—
1 Bed	—	$4,156.5	—
2 Bed	—	$5,997.5	—
3+ Bed	—	$8,200	—

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

639 UNION STREET LLC

Responsiveness Score

1200days

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 76 open HPD violations on record, including 16 Class C (the city's most serious category).
Is this building rent-stabilized?: Yes — this building appears on the DHCR rent-stabilized building list. Ask the landlord to confirm whether a specific apartment is stabilized.
How noisy is this building?: Neighbors filed 2 noise complaints with 311 in the past year, above the neighborhood median of 1 among buildings with any noise complaints.
How responsive is management to problems?: Resolved violations at this building closed in about 1200 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 Gowanus is about $4,157/month for a one-bedroom.

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