- Year built
- 1920
- Type
- Condominium
- Landmark
- No
373 3rd Street is a 1920 four-family house on a 20-foot-wide lot between Fifth and Sixth Avenues, being enlarged up and back into a four-residence condominium. The sponsor bought it in March 2025 for $2,900,000 per ACRIS and filed an offering plan in August 2026 with a total of $8,000,000, or $2 million a home.
The work is filed as a new building with existing elements to remain. That is a heavier job than a renovation: the building's height goes from 41 to 50 feet, and its construction floor area to about 5,850 square feet, from roughly 3,200 square feet of living area before the work.
Architecture and residences
JBA filed the main job in August 2025: "vertical and horizontal enlargement, interior renovation of existing 4-story and a cellar 4 family." The city approved the plans in December 2025 and issued the first permit in January 2026. The foundation, excavation-support and structural framing work for the enlargement were signed off in August 2026; plumbing was permitted in September 2026, and the sprinkler filing was under review in October 2026. Two earlier versions of the filing, from March and April 2025, were withdrawn. A separate 2025 alteration covered a general renovation with new windows and finishes.
The lot is 20 feet wide and 90 feet deep, about 1,800 square feet. The count stays at four homes, so the added space goes into larger units. About 5,850 square feet of construction works out to roughly 1,460 gross square feet per home, before deducting the cellar, halls and stairs. No floor plans have been published; confirm in the plan.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD260310), the plan was submitted August 20, 2026, with 373 PS LLC as sponsor. The record lists four residential units and a total offering price of $8,000,000. It shows no acceptance date as of October 2026. No asking prices have been published.
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.
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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.
What to know if you’re buying
No contracts until acceptance. A sponsor cannot take binding contracts until the Attorney General accepts the plan. Ask for the accepted plan and Schedule A when they exist.
What survives of the old house. A new building with existing elements to remain keeps some original walls and floors. Ask which elements remain, how the new structure ties into them, and what the engineer's report says.
Elevator or walk-up. The filings do not say whether the building gets an elevator. In a four-story building that matters for the upper homes' value; confirm in the plan.
Closing costs. In a sponsor sale the buyer customarily pays the New York State transfer tax (0.4%) and the New York City transfer tax (1.425% above $500,000), plus the mansion tax of 1% at $1 million. At the plan's $2 million average that is about $36,500 in transfer taxes and $20,000 in mansion tax. Use the calculators below to run your price.
Comparable buildings
If you're considering 373 3rd Street, also look at these Park Slope condominiums:
- 409 Third Street — four-home brownstone condominium on the same block
- 408 3rd Street — four three-bedroom homes in a renovated 1920 building on the same stretch of 3rd Street
- 501 8th Avenue — four-residence condominium conversion of a prewar building
- 205 14th Street — five-residence condominium conversion
- 18 Eighth Avenue — four-residence conversion of an 1899 house near Grand Army Plaza
- 445 5th Avenue — 30-residence new-construction condominium on Fifth Avenue
More Park Slope buildings
- 361 Sixth Avenue, 361 Sixth Avenue · Park Slope — 1905 condominium
- 363 Douglass Street — 1910 condominium
- 371 Douglass Street — condominium
- 378 12th Street — condominium
- 378 Eighth Street — condominium
- 379 12th Street — 2024 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.
Considering a move at 373 3rd Street?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
646.939.7375 · c.cohen@compass.com