831 UNION STREET
831 UNION STREET is a Class C3 (walk-up, pre-1929) building in Brooklyn (BBL 3009540056) built in 1920, with 4 residential units across 4 floors.
The building is in NYC community district 306, council district 39, zoning district R6A, on a 1,800-square-foot lot with a building footprint of 4,800 square feet.
The current registered owner of record per NYC PLUTO is 831 UNION STREET LLC.
MetroDeeds shows no confirmed ACRIS deed transfer for this BBL in the last 5 years of recorded NYC public-records data.
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 OfficerANDREA CASTELLANO
- Corporate Owner831 UNION ST LLC
- Managing AgentFILIPPO CASTELLANO
Most recent deed
Recent ACRIS documents (last 1)
Building stats
- Zoning:
- R6A
- Lot size:
- 1,800 sqft
- Building area:
- 4,800 sqft
- Floors:
- 4
- Assessed value:
- $1.3M
- Community district:
- 306
- Council district:
- 39
HPD violations
Recent HPD violation details
- 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 IInspected Nov 19, 2025§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE…
- Class AInspected Jun 11, 2025(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 Apr 12, 2024(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 IInspected Nov 20, 2023§27-2107 ADM CODE OWNER FAILED TO FILE A VALID REGISTRATION STATEMENT WITH THE DEPARTMENT AS REQUIRED BY ADM CODE §27-2097 AND IS THEREFORE…
Recent ACRIS activity
Frequently asked questions about 831 UNION STREET
Who owns 831 UNION STREET?
The current registered owner of record for 831 UNION STREET per NYC PLUTO is 831 UNION STREET LLC. MetroDeeds shows no confirmed ACRIS deed transfer for this BBL in the last 5 years of recorded NYC public-records data.
When was 831 UNION STREET last sold?
MetroDeeds shows no confirmed ACRIS deed transfer for 831 UNION STREET in the last 5 years of recorded NYC public-records data. NYC ACRIS coverage extends back to 1966; an absence in our 5-year window typically means either the BBL has not transacted recently, or the most recent recorded document is not a DEED type (such as a refinance rather than a sale).
How many HPD violations does 831 UNION STREET have?
No open HPD housing-maintenance code violations are on record for 831 UNION STREET 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 831 UNION STREET?
NYC Department of Finance assesses 831 UNION STREET at $1.27M 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 831 UNION STREET and what does that mean?
831 UNION STREET is NYC building class C3 — Walk-up, pre-1929. A walk-up apartment building constructed before 1929, typically 3-6 stories and often rent-stabilized. 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.