The owner filed 5 annual bedbug reports and reported no infested units. Filing with zero infestations is the compliant, reassuring case.
Evictions
No executed evictions on record for this building.
Housing court
No HPD housing-court cases on record for this building.
HPD housing-maintenance violations
6
Open now
18
On record
0
Open Class C
6
Open Class B
0
Open Class A
Class C is immediately hazardous, Class B is hazardous, Class A is non-hazardous. A violation stays open until HPD certifies the repair, so some open items may already be fixed.
CLASS B · HAZARDOUSApt 4RIssued 2017-06-055+ YRS OLD
§ 27-2046.1, 2046.2 HMC: PROVIDE AN APPROVED AND OPERATIONAL CARBON MONOXIDE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH APPLICABLE LAW AND RULES. IN THE ENTIRE APARTMENT LOCATED AT APT 4R, 4th STORY, 1st APARTMENT FROM EAST AT SOUTH
Status: Notice issued, not yet certified
CLASS B · HAZARDOUSApt 4RIssued 2017-06-055+ YRS OLDRENT-IMPAIRING
§ 27-2005 ADM CODE REPAIR THE ROOF SO THAT IT WILL NOT LEAK AT CEILING IN THE BATHROOM LOCATED AT APT 4R, 4th STORY, 1st APARTMENT FROM EAST AT SOUTH
Status: Notice issued, not yet certified
CLASS B · HAZARDOUSApt 4RIssued 2017-06-055+ YRS OLDRENT-IMPAIRING
§ 27-2005 ADM CODE REPAIR THE ROOF SO THAT IT WILL NOT LEAK AT CEILING IN THE KITCHEN LOCATED AT APT 4R, 4th STORY, 1st APARTMENT FROM EAST AT SOUTH
Status: Notice issued, not yet certified
CLASS B · HAZARDOUSApt 4RIssued 2017-05-305+ YRS OLD
§ 27-2026, 2027 HMC: PROPERLY REPAIR THE SOURCE AND ABATE THE EVIDENCE OF A WATER LEAK AROUND SKYLIGHT AT CEILING IN THE KITCHEN LOCATED AT APT 4R, 4th STORY, 1st APARTMENT FROM EAST AT SOUTH
Status: Notice issued, not yet certified
Rent regulation
Likely rent-stabilized
The owner registered 3 stabilized units with New York State for 2023 — of about 7 apartments.
18
19
20
21
22
23
2018 — 3 units registered2023 — 3
No public data says which specific apartment is stabilized.
Registration counts apply to the building, not to unit numbers. To confirm your own apartment, request your rent history from New York State Homes and Community Renewal — it is free and takes a few weeks.
Not on the city's tax-lien sale list (2019–2025). The owner has not fallen far enough behind on property tax or water charges to be flagged for a lien sale.
The building
1920
Built
4
Floors
7
Residential units
Walk-up apartments
Type
DOB building violations
3
Active
16
On record
0
Active, last 3 yrs
ACTIVE · LBLVIO-LOW PRESSURE BOILER BOILER REQUIRED2023-04-25
VIOLATION ISSUED-FAILURE TO FILE 2022 EXTERNAL LOW PRESSURE INSPECTION
ACTIVE · LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED2009-01-01
ACTIVE · LL6291-LOCAL LAW 62/91 - BOILERS BOILER REQUIRED1999-03-16
Unpaid city fines
$0
Balance due (active)
1
Active violations
0
Lost by default
DOB violations adjudicated by OATH carry money penalties. "Lost by default" means the owner never appeared at the hearing. An unpaid balance is a stronger "ignoring the city" signal than a raw violation count.
ConstructionNon-Hazardous2006-07-11$800 penalty
Concern level2 of 4
Moderate
012 open rent-impairing violation(s)
023 active DOB violation(s)
036 open HPD violation(s)
How this is set: open hazardous violations measured against the building's size, then raised by strong distress signals — HPD's enforcement program, court harassment findings, recent evictions, unpaid DOB fines, open housing-court cases, and a sold tax lien. Neighborhood noise and crime are not part of it. It describes the public record, not the condition of any one apartment, and a quiet record is not proof of a good building.
311 complaints from tenants
4
All time
0
Last 12 months
Heat/Hot Water3
Unsanitary Condition1
Unsanitary ConditionPests2025-07-31 · closed
Heat/Hot WaterEntire Building2020-03-17 · closed
Heat/Hot WaterEntire Building2020-03-03 · closed
Complaints record what a tenant reported, not a finding by the city. "Closed" often means the inspector could not gain access.
Neighborhood crime
About averagevs. NYC apartment blocks
199
NYPD reports · last 12 mo
17
≈ per month
Felony90
Misdemeanor87
Violation22
NYPD complaints reported within about 1,000 ft (a few blocks) in the last year, by severity. This reflects what gets reported and where police are active as much as actual safety, and busier, denser, higher-foot-traffic blocks log more. Locations are approximate — the NYPD shifts each report to the nearest corner for privacy — so read this as rough context, not a safety score.
Neighborhood noise
Higher than averagevs. NYC apartment blocks
638
Noise reports · last 12 mo
53
≈ per month
28
% from neighbors
Unspecified275
Residential179
Street/Sidewalk101
Commercial63
Vehicle20
311 noise complaints within about 1,000 ft (a few blocks) in the last year. Most reports here are about outdoor noise (mostly unspecified) — street life and traffic more than neighbors. This counts how often people call 311, which tracks how densely populated and busy an area is as much as how loud it is — it is not a sound measurement.
Landlord and related buildings
Registered owner
PROSPERITY INVESTMENT GROUP LLC
Head officer
DAVID WANG
Managing agent
Joni Zhang
No other buildings found sharing this building's registered contact.
This building and the landlord's others
This building
Ownership & money
5
Recorded sales
4
Mortgages / refinances
Last recorded sale2017-06-13 · $5,500,000
Most recent mortgage2017-06-13 · $2,000,000
Sale2017-06-13$5,500,000
51ST STREET EAST LLC → PROSPERITY INVESTMENT GROUP LLC
Mortgage2017-06-13$2,000,000
borrower PROSPERITY INVESTMENT GROUP LLC · lender CATHAY BANK
Sale2012-11-20$3,823,000
KUNZMANN, FREDERICK P, KUNZMANN, VLADISLAVA, KUNZMANN, VLADIA → 51ST STREET EAST LLC
FLAHERTY, JAMES, SKIBSTED, ROBERT → KUNZMANN, FREDERICKP., KUNZMANN, VLADIA
From ACRIS recorded documents. Amounts are often $0 or nominal for transfers between related parties, and LLCs can obscure who is really involved — treat this as public-record context, not a valuation.