641 ST MARKS AVENUE
641 ST MARKS AVENUE is a Class C1 (walk-up, over six families) building in Brooklyn (BBL 3012190069) built in 1900, with 30 residential units across 4 floors.
The building is in NYC community district 308, council district 36, zoning district R6B, on a 7,500-square-foot lot with a building footprint of 17,103 square feet.
The current registered owner of record per NYC PLUTO is PROSPECT HEIGHTS 637-641 REALTY LLC.
The most recent ACRIS deed transfer for this BBL was recorded on May 9, 2022 when PROSPECT BROOKLYN REALTY LLC conveyed the property to PROSPECT HEIGHTS 637-641 REALTY LLC for a non-disclosed consideration. The transaction was financed with a $8.20M mortgage from Popular Bank.
The building is registered with NYC HPD's landlord-registration system and has no open HPD housing-maintenance code violations on record as of May 18, 2026.
Data sourced daily from NYC PLUTO (Department of City Planning), NYC ACRIS (Department of Finance), and NYC HPD housing-maintenance code violations.
Owner of record
HPD registered contacts
- Head OfficerJOE PATRICKOWSKI
- Corporate OwnerPROSPECT HEIGHTS 637-641 REALTY LLC
- Managing AgentWATERSTONE GROUP LLC
Most recent deed
Recent ACRIS documents (last 5)
Building stats
- Zoning:
- R6B
- Lot size:
- 7,500 sqft
- Building area:
- 17,103 sqft
- Floors:
- 4
- Assessed value:
- $1.1M
- Community district:
- 308
- Council district:
- 36
HPD violations
Recent HPD violation details
- Class AInspected May 7, 2026(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 HPD…
- Class AInspected May 6, 2026(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 HPD…
- Class BInspected May 6, 2026§ 27-2005 ADM CODE PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE CONCRETE LANDING AT STOOP
- Class BInspected May 6, 2026§ 27-2005 ADM CODE PROPERLY REPAIR WITH SIMILAR MATERIAL THE BROKEN OR DEFECTIVE CONCRETE TREAD 2 UP FROM BOTTOM AT STOOP
- Class BInspected Apr 21, 2026§ 27-2026, 2027 HMC: PROPERLY REPAIR THE SOURCE AND ABATE THE EVIDENCE OF A WATER LEAK AT CEILING IN THE BATHROOM LOCATED AT APT 1C, 1st STO…
Recent ACRIS activity
Frequently asked questions about 641 ST MARKS AVENUE
Who owns 641 ST MARKS AVENUE?
The current registered owner of record for 641 ST MARKS AVENUE per NYC PLUTO is PROSPECT HEIGHTS 637-641 REALTY LLC. The most recent ACRIS deed transfer for this BBL was recorded on May 9, 2022 when the property was conveyed to PROSPECT HEIGHTS 637-641 REALTY LLC. PLUTO ownership is refreshed monthly by NYC Department of Finance; the registered owner may not reflect transactions recorded within the last 30 days.
When was 641 ST MARKS AVENUE last sold?
The most recent ACRIS deed transfer for 641 ST MARKS AVENUE was recorded on May 9, 2022, when PROSPECT BROOKLYN REALTY LLC conveyed the property to PROSPECT HEIGHTS 637-641 REALTY LLC for a non-disclosed consideration. The transaction was financed with a $8.20M mortgage from Popular Bank.
How many HPD violations does 641 ST MARKS AVENUE have?
No open HPD housing-maintenance code violations are on record for 641 ST MARKS AVENUE as of May 18, 2026. The building is registered with NYC HPD's landlord-registration system. HPD violation data is pulled daily from the NYC Open Data violations feed.
What is the assessed value of 641 ST MARKS AVENUE?
NYC Department of Finance assesses 641 ST MARKS AVENUE at $1.14M for the current tax year. NYC assesses property at a fraction of estimated market value (the assessment ratio varies by tax class — 6% for tax class 1 one-to-three-family dwellings, approximately 45% for tax class 2 rental apartment buildings), so the market value implied by this assessment is meaningfully higher. Assessment data is published by NYC Department of Finance.
What building class is 641 ST MARKS AVENUE and what does that mean?
641 ST MARKS AVENUE is NYC building class C1 — Walk-up, over six families. A 3-to-6-story walk-up apartment building with more than 6 residential units. Building class is assigned by NYC Department of Finance and recorded in PLUTO; it determines the property's tax class and the regulatory regime that applies.