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Building and Landlord Data Analysis Report

531 Knickerbocker Avenue, Brooklyn, NY 11221

2
DOB Complaints
21
311 Housing Calls
5
Housing Violations
0
Permits

Risk Assessment

95
Low Risk

This building shows minimal signs of maintenance issues based on our analysis.

Our AI predicts there is a 95% chance of no major maintenance issues.
Augrented Insights Report for 531 Knickerbocker Avenue

The 23-unit, 4-story New Law Tenement at 531 Knickerbocker Avenue in Bushwick, owned by Leib Flohr, has experienced persistent maintenance challenges over the past several years. Most notably, the building has ongoing rat infestation issues, with multiple rat activity inspections conducted between 2023 and 2025 showing consistent problems.

The most recent inspection in June 2025 resulted in a failed compliance inspection for "Other Reasons." In 2024, there were violations found related to self-closing doors in the fire staircase B at public hall levels 1 and 2, which remains an open Class C violation as of May 2025. The building's maintenance history reveals concerns about basic habitability, with several door-related issues documented between 2020 and 2024, including emergency complaints. Mould and water leak problems were reported in 2018, affecting resident living conditions.

While the building has maintained a bedbug report showing no current infestations from 2022 to 2024, historical records indicate previous incidents in 2020-2021. The property has also faced scrutiny regarding unauthorized uses, with multiple complaints about illegal hotel rooms and conversions between 2023 and 2025, resulting in vacate orders and violations. These ongoing pest control issues, along with various maintenance violations and emergency repairs, suggest persistent challenges in building maintenance and compliance with housing codes.

Last updated: July 27, 2025
This report is created with AI and based on the most recent 10 data items in each category. Full reports with 50+ data points are available to subscribers.

531 Knickerbocker Avenue Report Contents

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531 Knickerbocker Avenue Building Overview

Renter Risk Rating

This building is in the riskiest 10% of buildings in Bushwick.

Building Characteristics

Total units 23
Year built 1905
Total area 16000 sq ft
Floors 4
Tax Abatements None
Building Class NEW LAW TENEMENT
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Key Building Statistics

2
DOB Complaints
Complaints filed with the Department of Buildings in the last 7 years.
5
Housing Violations
Class B & C housing maintenance code violations.
21
311 Housing Calls
Housing-related 311 service requests in the last 7 years.
0
Work Orders
Repair orders issued by city agencies.
0
ECB Violations
Environmental Control Board violations on record.
0
Evictions
Evictions executed by city marshalls.
18
Rodent Inspections
Rodent inspections conducted by DOHMH.
0
Building Permits
Permits issued by DOB in the last 7 years.

Included Addresses

  • 531 Knickerbocker Ave, New York, NY 11221
  • 527 Knickerbocker Ave, New York, NY 11221

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531 Knickerbocker Avenue Landlord Information

HPD Registration Contacts

Contact data is from NYC HPD building registration.

RoleNameAddress

Landlord Portfolio

Other NYC buildings registered to this landlord.

AddressUnitsCode ViolationsRisk Rating

Landlord Court Records

NYC housing court and civil court records. Name matching only; verify parties are actually the owners by reviewing the case files!

Date FiledCase TitleCourtLink
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531 Knickerbocker Avenue Rent Control Status

Year Built
Built before 1974
Units
More than 6 units
RGB Registration
Not registered
Tax Abatement
None found
Year BuiltUnitsRGB RegistrationTax Abatement
Before 1974 >6 units Not registered None

Full Building Data for 531 Knickerbocker Avenue

Housing Maintenance Code Complaints

This table shows complaints to 311 related to potential NYC Housing Maintenance Code (HMC) for 531 Knickerbocker Avenue. These complaints are related to conditions such as lack of heat, hot water, mold, pests, and other habitability issues. Class B and C violations are the most serious and may indicate significant problems with building maintenance or safety.

Date ReceivedSttatus DateCategoryTypeStatus
2023-07-182024-05-29Door/window-DoorEmergencyCLOSE
2020-10-052020-10-08Door/window-DoorEmergencyCLOSE
2020-09-132020-10-03Water Leak-Heavy FlowEmergencyCLOSE
2018-12-132018-12-28Unsanitary Condition-MoldEmergencyCLOSE
2018-11-132018-11-22Unsanitary Condition-MoldEmergencyCLOSE
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Housing Maintenance Code Violations

This table shows violations of the NYC Housing Maintenance Code (HMC) issued by HPD for 531 Knickerbocker Avenue. These violations are related to conditions such as lack of heat, hot water, mold, pests, and other habitability issues. Class B and C violations are the most serious and may indicate significant problems with building maintenance or safety.

Inspection DateClassStatusStatus DateApartmentNOV DescriptionCertified Date
2024-05-15COpenNoneNone§ 27-2005, 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 AT FIRE STAIRCASE ''B'' DOOR AT PUBLIC HALL, 2nd STORYNone
2024-05-15COpenNoneNone§ 27-2005, 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 FIRE STAIRCASE ''B'' DOOR FRAME AT PUBLIC HALL, 1st STORYNone
2024-05-15BCloseNoneNone§ 27-2005 HMC: PROPERLY REPAIR OR REPLACE THE BROKEN OR DEFECTIVE LATCH FIRE STAIRCASE ''B '' DOOR AT PUBLIC HALL, 2nd STORY2024-06-26T00:00:00.000Z
2022-02-25ACloseNoneNone(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS.None
2020-10-07ACloseNoneNone§ 329, M/D LAW AND DEPT. RULES AND REGS. PROVIDE A COMPLETED CERTIFICATE OF INSPECTION VISITS IN A PROPER FRAME AT OR NEAR MAILBOXES, BOTTOM EDGE OF FRAME BETWEEN 48-62 INCHES ABOVE FLOOR MISSING AT PUBLIC HALL, 1st STORY2020-03-12T00:00:00.000Z
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311 Service Requests

Service requests made to 311 for 531 Knickerbocker Avenue. Data from NYC 311.

Created DateTypeDescriptionStatusAgencyResolution
2024-01-12 10:55RodentRat SightingClosedDOHMH
2024-01-12 10:45RodentRat SightingClosedDOHMH
2024-01-12 10:42RodentRat SightingClosedDOHMH
2024-01-12 10:33RodentRat SightingClosedDOHMH
2023-07-18 19:23DOOR/WINDOWDOORClosedHPD
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DOB Complaints

Department of Buildings complaints regarding 531 Knickerbocker Avenue.

Complaint #FiledStatusCategoryInspection DateDisposition
2025-05-07CLOSEDIllegal Conversion No Access Follow-Up2025-05-07Violation Served For Disobeying A Vacate Order (2025-05-07)
2025-04-10CLOSEDConstruction Enforcement Work Order (DOB)2025-04-10Compliance Inspection Performed (2025-04-10)
2025-04-04CLOSEDIllegal Hotel Rooms in Residential Buildings2025-04-04Partial Vacate Order Served (2025-04-04)
39391382023-12-13CLOSEDIllegal Hotel Rooms in Residential Buildings2024-01-04Insufficient Information/unable To Locate Address (2024-01-04)
38979912023-03-21CLOSEDIllegal Conversion2023-04-20Inspector Unable To Gain Access – 2nd Final Attempt (2023-04-21)
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DOB Violations

Department of Buildings violations regarding 531 Knickerbocker Avenue.

Date IssuedCategoryDescriptionStatusComments
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Indoor Environment Complaints (DOHMH)

The table below shows indoor environment complaints received regarding the conditions at 531 Knickerbocker Avenue. The information includes the date, type, description, and status of each complaint. The data is sourced from DOHMH/311.

DateTypeDescriptionStatus
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Bedbug Infestations

The table below shows the bedbug reports filed by the landlord for 531 Knickerbocker Avenue. The information includes the file date, infested units, eradicated units, re-infested units, filing start date, and filing end date. The data is sourced from DOHMH. Landlords are required to file these reports; missing data may indicate non-compliance.

File DateInfested UnitsEradicated UnitsRe-infested UnitsFiling Start DateFiling End Date
2024-12-230002023-11-012024-10-31
2023-12-220002022-11-012023-10-31
2022-12-200002021-11-012022-10-31
2022-02-281102020-11-012021-10-31
2021-02-192202019-11-012020-10-31
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Rodent Inspections

Recent rodent inspection results for 531 Knickerbocker Avenue. Data from NYC DOHMH.

DateTypeResult
2025-06-20ComplianceFailed for Other R
2025-05-08InitialRat Activity
2024-12-18ComplianceRat Activity
2024-11-06InitialRat Activity
2024-06-17ComplianceRat Activity
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HPD Litigation Explanation

The table below shows the HPD litigation records for 531 Knickerbocker Avenue. The information includes the open date, case type, status, judgement, penalty and whether harassment was found. The data is sourced from HPD.

Source: HPD
Open DateCase TypeStatusJudgementPenaltyHarassment found
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OATH Cases Explanation

The table below shows the Office of Administrative Trials and Hearings cases for 531 Knickerbocker Avenue. The information includes the date, agency, respondent, charge, result, penalty, and status. The data is sourced from OATH.

Source: Office of Administrative Trials and Hearings (OATH)
DateAgencyRespondentChargeResultPenaltyStatus
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ECB Violations

Environmental Control Board violations for 531 Knickerbocker Avenue. Data from ECB.

DateNumberRespondentDescriptionStatusPenaltyBalance Due
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Alternative Enforcement Program (AEP) Explanation

The table below shows the Alternative Enforcement Program (AEP) records for 531 Knickerbocker Avenue. The information includes the start date, start violations, discharge date, and status. The data is sourced from HPD.

Source: Department of Housing Preservation and Development (HPD)
Start DateStart ViolationsDischarge DateStatus
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Vacate Orders Explanation

The table below shows the vacate orders for 531 Knickerbocker Avenue. The information includes the effective date, rescinded date, reason, type, and units. The data is sourced from DOB.

Source: Department of Buildings (DOB)
Effective DateRescinded DateReasonTypeUnits
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Work Orders Explanation

The table below shows the work orders for 531 Knickerbocker Avenue. The information includes the date created, type, description, and charge. The data is sourced from HPD.

Source: Department of Housing Preservation and Development (HPD)
Date CreatedTypeDescriptionCharge
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Liens Explanation

The table below shows tax and water liens for 531 Knickerbocker Avenue. Information includes tax class, month, water only flag, amount, and cycle. Data is sourced from NYC Department of Finance.

Source: NYC Department of Finance
Tax ClassMonthWater OnlyAmountCycle
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Case NumberDateTypeStatusDetails

Sales Records

Sales transactions for 531 Knickerbocker Avenue. Data includes sale date, price, buyer, and seller.

DatePriceBuyerSeller

Asbestos Records

Asbestos abatement filings and records for 531 Knickerbocker Avenue. Data includes filing date, type, and status.

Start DateEnd DateStatusProcedureFloor

Fire Violations

Violations issued by the Fire Department for this property.

Violation NumberDateDescriptionStatus
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Fire Inspections

Fire Department inspection records for this property.

DateTypeResult
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Fire Certificates

Fire safety certificates for this property.

TypeIssue DateExpiration
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Water Connections

Water connection permits and records for 531 Knickerbocker Avenue. Data includes connection type, date, and status.

MaterialRecord Type

Elevator Permits

Elevator permit records for 531 Knickerbocker Avenue. Data includes permit type, issue date, and status.

TypeIssue DateStatus

Landmark Violations

Landmark preservation violations for 531 Knickerbocker Avenue. Data includes violation date, type, and status.

DateTypeStatus

Planning Projects

City Planning (ZAP) project applications for this building. Data includes project ID, status, borough, and lot/block information.

Project IDStatusBoroughBlockLot
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Building Permits

Department of Buildings issued building permits for this property. This includes permits for construction, alteration, and demolition work. Data includes permit type, job number, status, and issue date.

Permit TypeJob NumberStatusIssue Date

Electrical Permits

Department of Buildings issued electrical permits for this property. This includes permits for electrical work, installations, and modifications. Data includes permit type, job number, status, and issue date.

Permit TypeJob NumberStatusIssue Date

How 531 Knickerbocker Avenue Compares

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