657 Baltic Street
657 Baltic Street, Brooklyn, NY 11217
Park Slope, Brooklyn
BBL 3009377507 · BIN 3018825
- Year built
- 1901
- Type
- Condominium
- Landmark
- Landmark or historic district
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 657 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.
657 Baltic Street is a four-residence condominium on a 20-by-100-foot lot on the Fourth Avenue end of Park Slope. It is small, and it is nearly finished selling: ACRIS shows sponsor deeds on three of the four homes between September and December 2023, at $1,515,000, $1,599,000 and $1,861,556.
That gives a buyer recorded prices to work from rather than asking prices. The one residence without a recorded sponsor deed is Unit 1. If it comes to market, it will be the last sponsor unit in a building whose other three owners are already in place.
The total offering of $7.3 million averages $1.825 million per residence.
Architecture and residences
The lot held a three-family walk-up that PLUTO dates to 1901. The sponsor's filings with the Department of Buildings began in August 2021. Anthony Cucich Architect filed the main job, B00577625, which describes a general renovation of the existing four-story building with horizontal and vertical extensions. The Department of Buildings classed it as a new building with existing elements to remain. The filing takes the building from three dwelling units to four, at about 50 feet and 5,108 square feet of construction floor area. Interior demolition, façade repair and joist replacement were filed separately in 2021. The main job shows a certificate of occupancy issued.
The top home, Unit 4, is a two-story penthouse that listing records describe as three bedrooms and two baths, with a home office on the upper level and close to 900 square feet of private terrace and roof deck facing north and south. PLUTO records 3,060 square feet of building area for the condominium. That figure may not include the extension. Confirm unit sizes against Schedule A of the offering plan.
The offering plan record lists the construction type as new. City records treat the building as a heavily rebuilt 1901 structure. Buyers should read the plan's building description and engineer's report with that in mind.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD220063), the plan was submitted March 15, 2022 and accepted October 28, 2022, with 657 Baltic LLC as sponsor. It was declared effective June 15, 2023. The initial total offering price was $6,900,000. The current total is $7,300,000, a $400,000 increase across amendments. The Attorney General's plan page returned no data when we checked in October 2026, so the amendments themselves were not reviewed for this profile. The figures here come from the Attorney General's plan database.
The database records one unit sold. ACRIS shows three sponsor deeds, so the database figure is out of date.
Recorded sales
ACRIS shows the condominium declaration recorded September 6, 2023 and these sponsor deeds:
- Unit 2: $1,515,000, deed dated September 13, 2023, recorded February 2024
- Unit 3: $1,599,000, deed dated September 26, 2023, recorded October 2023
- Unit 4 (penthouse): $1,861,556.25, deed dated December 4, 2023, recorded January 2024
Listing records show Unit 4 first offered at $1,899,000 in September 2023 and closing at $1,825,000, with common charges of $627 a month and taxes of $3,588 a year at the time. The deed amount is about 2% higher than the closing price, which is consistent with the buyer's payment of the sponsor's transfer taxes being added to the consideration. Read $1,825,000 as the contract price; that is our arithmetic from the two records, not a recorded figure.
The three deeds total $4,975,556. ACRIS shows no deed for Unit 1. Documents recorded against it in 2024 are financing and authority filings, not a sale. Unit 1 was marketed for sale with immediate occupancy; that listing record is now inactive, and no current ask was found in October 2026. Public records do not establish whether Unit 1 is held, leased or still offered. If it is leased, a buyer would take it subject to the lease, so ask the sponsor before making an offer. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
Local Law 97
This building is below the 25,000 sq ft threshold at which LL97 limits apply to a building on its own. It is still covered if it shares a tax lot or condominium board with buildings totaling over 50,000 sq ft; confirm on DOB’s covered-buildings list.
See full Local Law 97 analysis →Recent sales
Recent closings at this building, from The Roebling Research Library. 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 18, 2024 | 1 | 3 BR · 2 BA · 1,611 sf | $1,775,000 | $1,102/sf | -11.0% |
Market read. Most recent trades (2024) cleared a median $1,102/sf (recorded) across 1 sale. Median listing discount 6.5% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00937-7507; each condominium apartment is its own tax lot). Apartment-level facts (line, condition, asking-price context) curated and cross-verified in The Roebling Research Library. 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.
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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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What to know if you’re buying
Unit 1 is the open question. Ask whether it is offered under the plan now, at what price, and whether a tenant is in place.
Small-building governance. With four owners, every common-charge decision and capital repair is shared four ways. Read the budget's reserve line and the insurance schedule.
Closing costs. In sponsor sales the buyer customarily pays the New York State transfer tax (0.4%) and the New York City real property transfer tax (1.425% above $500,000), plus the state mansion tax of 1% at $1 million and above. Use the calculators below to run your price.
Rebuilt shell. Ask for the engineer's report and the certificate of occupancy. Find out which walls, floors and façade elements are original to the 1901 building and which are new.
Comparable buildings
If you're considering 657 Baltic Street, also look at these Park Slope and South Slope condominiums:
- 643 Baltic Street — condominium conversion a few doors west on the same block, marketed in 2025
- 613 Baltic Street — Baltic Park Slope, a 43-residence 2016 new-construction condominium at the Fourth Avenue end of the block
- 601 Baltic Street — 21-residence new-construction condominium, plan effective in 2024
- 636 Warren Street — 24-apartment walk-up conversion one block south
- 248 20th Street — another enlargement and conversion of an 1899 house into condominiums
- 249 18th Street — five-residence, one-per-floor South Slope condominium
More Park Slope buildings
- 643 Baltic Street — 1920 condominium
- 648 Second Street — 1903 co-op
- 655 Baltic Street — condominium
- 659 Baltic Street — 2008 condominium
- 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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646.939.7375 · c.cohen@compass.com