351 Union Street
351 Union Street, Brooklyn, between Smith and Hoyt Streets, in Carroll Gardens
BBL 3004287507 · BIN 3007032
- Year built
- 1920
- Type
- Condominium
- Units
- 2
- Floors
- 4
- Landmark
- No
Every recorded sale at this building, 2017–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $1,613
- Listing discount
- -2.5%
- Recorded sales
- 6
- On record
- 2017–2026
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A Private Pricing Opinion — what your apartment at 351 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.
About the building
351 Union Street was renovated from a four-family house into a two-residence condominium. Richard Goodstein's DOB alteration was fully permitted in May 2018 and signed off in January 2021. The work included structural, mechanical, plumbing and sprinkler alterations. The two homes extend through several levels of the older townhouse.
The lower residence is a garden triplex with a rear terrace off the kitchen and a separate backyard. Its cellar supplies recreation, laundry and storage space. Above, the other home has roof-level outdoor accommodation. The renovated interiors include central air conditioning and in-home laundry, with a video intercom at the entrance. Rear glazing opens the parlor-level living area toward the terrace.
Recent sales
Recent closings at this building, curated by The Roebling Team research desk. Prices are the transfer amounts recorded with the NYC Department of Finance; apartment-level detail is checked against the building’s own file in The Roebling Research Library before publishing.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Jun 29, 2026 | A | 3 BR · 3 BA · 2,124 sf | $3,425,000 | $1,613/sf | +3.9% |
| Dec 2, 2024 | B | 3 BR · 2.5 BA · 1,673 sf | $3,125,000 | $1,868/sf | +0.0% |
| Oct 29, 2024 | 1 | 3 BR · 2.5 BA · 2,124 sf | $3,250,000 | $1,530/sf | +8.5% |
| Jun 29, 2020 | A | 3 BR · 2.5 BA · 2,124 sf | $2,500,000 | $1,177/sf | +1.0% |
| Jun 24, 2020 | B | 3 BR · 2.5 BA · 1,673 sf | $2,375,000 | $1,420/sf | off-mkt |
Market read. Most recent trades (2026) cleared a median $1,613/sf across 1 sale. Median listing discount -2.5% over ask.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
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 3-00428-7507) 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; square footage from recorded condo declarations and offering plans.
At the recent median sale of $3.25M (3 sales since 2024), a buyer putting 25% down would pay about $137,547 to close, or 4.2% of the price.
- Mansion tax: $48,750
- Mortgage recording tax: $46,922
- Title insurance: $14,625
- Attorneys, lender, building fees, reserves and filings: $27,250
Assumes a resale (the seller pays transfer taxes), a $4,500 attorney fee and a mortgage on the rest.
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What to know if you’re buying
With just two owners, agreement on the building budget and major repairs has particular importance. The condominium's decision and deadlock provisions matter when one owner wants work that the other does not. Financing also depends on a lender accepting a two-residence project. The lower home's finished cellar is recreation space and should not be counted as another bedroom floor.
Comparable buildings
- The Westcott — A manufacturing-building conversion with enlarged loft residences and elevator access.
- 255 Columbia Street — A larger condominium created through the renovation and enlargement of an older building.
- 132 Remsen Street — An older house converted into a small walk-up condominium in Brooklyn Heights.
More Carroll Gardens buildings
- 339 Sackett Street — 1986 co-op
- 344 Degraw Street — 2000 condominium
- 345 Carroll Street — 2015 condominium
- 358 Court Street — 1851 condominium
- 361 Clinton Street — 1987 condop
- 364 Union Street
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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