370 Union Street
370–372 Union Street · Carroll Gardens
BBL 3004367501 · BIN 3007283
- Year built
- 1910
- Type
- Condominium
- Landmark
- No
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A Private Pricing Opinion — what your apartment at 370 Union Street would likely sell for today, what it costs to sell, and what you’d walk away with — reviewed personally against condition, exposures, renovation quality, and the competition actually on the market.
370 Union Street is a four-story prewar apartment house converted to condominium ownership through a non-eviction plan. Its sixteen residences include two- and three-bedroom homes behind a landscaped front garden. The building preserves the dimensions and interior details of an early apartment house within a separately deeded ownership structure.
The Attorney General accepted the conversion filing in March 2009, and it became effective in July 2010. Lido Realty LLC was the conversion sponsor. At filing, ten of the sixteen apartments were classified as regulated and six as unregulated; that is the conversion-era mix, not a current count of occupied rental homes.
Architecture and unit composition
The building spans nearly 58 feet of frontage and extends approximately 81 feet into its lot. A broad apartment-house footprint accommodates several homes per floor. The landscaped setback provides a buffer between the entrances and Union Street.
Two- and three-bedroom plans commonly have one bathroom. Recorded areas in the sale history include homes around 900–1,000 square feet. Individual renovations have changed kitchens and room arrangements within those original apartment footprints.
High ceilings, wood floors, decorative trim and transom windows survive in parts of the interior inventory. Some homes retain more divided plans, while others have kitchens open to their living and dining spaces. Front and rear rooms have different exposures, with south-facing rear rooms documented among the apartments.
Building operations
The building is a walk-up, with voice intercom at the entrance. In-unit washer/dryers are present in renovated apartments. The condominium has no separately assessed commercial lots on the current roll.
A single owner holds six of the sixteen residential apartments, approximately 38% of the inventory. The building therefore combines individually owned homes with a substantial retained ownership block. Its non-eviction conversion history also means that the existence of condominium deeds should not be treated as proof that every apartment is vacant or freely deliverable. The Attorney General's 2026 filing still showed the sponsor in control of the board.
Policy framework
Pets: Permitted — confirm with the managing agent. Rentals: Permitted subject to condominium rules — confirm with the managing agent. In-unit washer/dryer: Present in apartments — confirm installation requirements with the managing agent.
Recent sales
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Recent closings at this building, sourced from NYC Department of Finance records. Apartment-level detail (line, condition, asking-price context) verified upon consultation request.
| Date | Unit | Price |
|---|---|---|
| Apr 29, 2025 | 3B | $1,550,000 |
| Jan 3, 2023 | 2B | $1,250,000 |
| Dec 28, 2021 | 4A | $600,000 |
| Jun 16, 2021 | 3B | $1,270,000 |
| Feb 24, 2020 | 4D | $895,000 |
| Sep 17, 2013 | 1B | $641,497.5 |
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00436-7501) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price.
Buying here? Condo closing costs with a mortgage typically run 3 to 6% of the price. See NYC co-op and condo closing costs, line by line.
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Comparable buildings
- 358 Court Street: A condominium adapted from a nineteenth-century church complex, offering another historic ownership option locally.
- The Westcott: A small condominium conversion with industrial loft space and later upper floors.
- The Landmark at Strong: A Gothic Revival church conversion with highly varied residential layouts.
- The Mill: A larger factory-to-condominium conversion that includes multilevel homes.
- 255 Columbia Street: A small condominium enlarged into an elevator building with two apartments on typical floors.
More Carroll Gardens buildings
- 358 Court Street — 1851 condominium
- 361 Clinton Street — 1987 condop
- 364 Union Street
- 391 Clinton Street — 1909 co-op
- 406 Degraw Street — 1899 condominium
- 411 Clinton Street — 1920 condominium
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Carroll Gardens.
How to read the facts on this page. Items attributed to an offering plan describe the building as it was offered at that filing — unit mix, square footage, the amenity program as planned. They are not a statement about how the building operates today. Tax and compliance figures are sourced separately to current City records and carry their own dates. House rules, staffing and fee policy can change by board resolution without any public filing: treat every policy line here as a starting point for diligence and confirm it with the managing agent. Where this page compares one building or neighborhood to another, that is our analysis of the recorded record — it names the measure, the period and the sample it rests on, and it is an observation about medians rather than a prediction about any particular apartment.
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