643 Baltic Street
643 Baltic Street, between Fourth and Fifth avenues · Park Slope
BBL 3009377506 · BIN 3018828
- Year built
- 1920
- Type
- Condominium
- Landmark
- No
- Amenities
- Private outdoor space, central air conditioning, storage and intercom entry
Every recorded sale at this building, 2023–2025
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $1,637
- Listing discount
- 7.1%
- Recorded sales
- 6
- On record
- 2023–2025
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 643 Baltic 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
643 Baltic Street is a townhouse conversion on the western side of Park Slope, close to Fifth Avenue. Its condominium filing was accepted in February 2025 under sponsor Nevins Estates LLC. The older building retains a narrow row-house footprint, with apartments reached by stairs.
The homes offered at launch included floor-through apartments, a garden duplex and an upper duplex with two roof terraces and a balcony. The garden residence extends into a lower level, while the upper home has three bedrooms and outdoor areas facing both north and south. Central air conditioning, oversized windows and private storage accompany the reconstructed interiors.
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 |
|---|---|---|---|---|---|
| Nov 26, 2025 | 2 | 2 BR · 2 BA · 962 sf | $1,575,000 | $1,637/sf | -7.1% |
| Nov 26, 2025 | TWO | 2 BR · 2 BA · 962 sf | $1,575,000 | $1,637/sf | -7.1% |
| Aug 28, 2025 | 1 | 2 BR · 2 BA · 1,895 sf | $2,270,000 | $1,198/sf | -5.4% |
| Jul 16, 2025 | 4 | 3 BR · 2 BA · 1,208 sf | $2,200,000 | $1,821/sf | +0.0% |
| May 4, 2023 | — | 4 BR · 4 BA · 2,545 sf | $1,950,000 | $766/sf | -11.4% |
Market read. Most recent trades (2025) cleared a median $1,637/sf across 4 sales. Median listing discount 7.1% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
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 3-00937-7506) 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 $2.2M (4 sales since 2024), a buyer putting 25% down would pay about $92,633 to close, or 4.2% of the price.
- Mansion tax: $27,500
- Mortgage recording tax: $31,763
- Title insurance: $9,900
- Attorneys, lender, building fees, reserves and filings: $23,470
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
Several outdoor areas sit over enclosed rooms. The upper terraces and balcony create different maintenance responsibilities from the garden below. A purchase should establish who maintains each terrace surface, railing and drain, and how access is provided when the condominium repairs the roof beneath an exclusive outdoor area.
Comparable buildings
- 220 Park Place — A small townhouse condominium with a similarly limited number of owners.
- 153 Lincoln Place — Another prewar Park Slope condominium with a larger association.
- Timber House — A nearby contemporary condominium for buyers comparing new interiors and outdoor space with a townhouse conversion.
More Park Slope buildings
- 632–634 11th Street — 1903 condominium
- 636 Warren Street — 1920 condop
- 64 Seventh Avenue — 1889 condop
- 648 Second Street — 1903 co-op
- 667 Degraw Street — 1899 condominium
- 668 Baltic Street — condominium
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Park Slope.
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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