50 DIAMOND STREET
50 DIAMOND STREET is a Class C2 (walk-up, five to six) building in Brooklyn (BBL 3026850062) built in 1931, with 6 residential units across 3 floors.
The building is in NYC community district 301, council district 33, zoning district R6B, on a 2,500-square-foot lot with a building footprint of 3,900 square feet.
The current registered owner of record per NYC PLUTO is TROJANOWSKI, JOLANTA.
The most recent ACRIS deed transfer for this BBL was recorded on July 24, 2023 when Trojanowski, Jolanta; Trojanowski, Yolanta; Trojanowski (deceased), Kazimierz conveyed the property to Iga Trojanowski As Trustee; Jolanta Trojanowski Trust for a non-disclosed consideration. The transaction was recorded as cash (no paired mortgage instrument).
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 OfficerKAZIMIERZ TROJANOWSKI
- Managing AgentJOLANTA TROJANOWSKI
Most recent deed
Recent ACRIS documents (last 1)
Building stats
- Zoning:
- R6B
- Lot size:
- 2,500 sqft
- Building area:
- 3,900 sqft
- Floors:
- 3
- Assessed value:
- $629K
- Community district:
- 301
- Council district:
- 33
HPD violations
Recent HPD violation details
Recent ACRIS activity
Frequently asked questions about 50 DIAMOND STREET
Who owns 50 DIAMOND STREET?
The current registered owner of record for 50 DIAMOND STREET per NYC PLUTO is TROJANOWSKI, JOLANTA. The most recent ACRIS deed transfer for this BBL was recorded on July 24, 2023 when the property was conveyed to Iga Trojanowski As Trustee; Jolanta Trojanowski Trust. 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 50 DIAMOND STREET last sold?
The most recent ACRIS deed transfer for 50 DIAMOND STREET was recorded on July 24, 2023, when Trojanowski, Jolanta; Trojanowski, Yolanta; Trojanowski (deceased), Kazimierz conveyed the property to Iga Trojanowski As Trustee; Jolanta Trojanowski Trust for a non-disclosed consideration. The transaction was recorded as cash (no paired mortgage instrument).
How many HPD violations does 50 DIAMOND STREET have?
No open HPD housing-maintenance code violations are on record for 50 DIAMOND 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 50 DIAMOND STREET?
NYC Department of Finance assesses 50 DIAMOND STREET at $629K 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 50 DIAMOND STREET and what does that mean?
50 DIAMOND STREET is NYC building class C2 — Walk-up, five to six. A 3-to-6-story walk-up apartment building, 5-6 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.