350 Sixth Avenue
350 Sixth Avenue, Brooklyn, NY 11215
Park Slope, Brooklyn
BBL 3009857506 · BIN 3021219
- Year built
- 1920
- Type
- Condominium
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 350 Sixth Avenue 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.
350 Sixth Avenue is a four-residence condominium in a 1920 walk-up on Sixth Avenue in central Park Slope, next door to 352 Sixth Avenue, a separate four-unit condominium in another 1920 building. The sponsor renovated the four apartments, filed an offering plan in January 2025, listed the homes in June 2025, and closed all four between October 15 and 17, 2025.
The deeds total $8.69 million. Removing the transfer taxes the buyers appear to have paid on the sponsor's behalf, the four prices equal the last asking prices exactly: $1,895,000 to $1,995,000 for the two-bedroom floors and $2,695,000 for the garden duplex. That is about $1,860 to $1,960 per square foot for the upper homes and $1,500 for the duplex.
The building is sold out. Any purchase now is a resale from an individual owner; one owner relisted Residence 2 in 2026 at $1,975,000.
Architecture and residences
City records describe a four-story building from 1920 on a lot just under 20 feet wide and 77 feet deep, with about 4,283 square feet of floor area. The Department of Buildings job, filed in November 2024 and permitted in December 2024, covers an interior renovation of the existing four-family building to obtain a new certificate of occupancy. It did not add floors or units. The public record does not yet show a new certificate of occupancy on the job; confirm its status.
Per listing records:
- Garden residence: two bedrooms and two and a half baths in a 1,794-square-foot duplex, with a 117-square-foot deck stepping down to a 435-square-foot garden and a lower-level recreation room with a wet bar
- Residences 2, 3 and 4: two-bedroom floor-throughs of about 1,017 square feet; Residence 4 on the top floor has a private roof deck
Published finishes include Bertazzoni appliances, polished marble counters, Carrara marble baths with satin brass fixtures, central air and in-unit washers and dryers. Listed common charges ran $526 to $613 a month. The listing records state that real estate taxes reflect a 20-year tax abatement but do not name the program; we have not verified it. The building next door at 352 Sixth Avenue carries a J-51 benefit, per city records.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD250022), the plan was submitted January 24, 2025 and accepted May 22, 2025, with 350 PS LLC as sponsor. The initial offering price was $9,550,000; the current total is $9,400,000, a reduction of $150,000 by amendment. The record we reviewed shows no effective date and no units sold, which is out of date: ACRIS shows all four sold.
The four prices total $8,535,000, which is $865,000 below the plan's current total. The plan was priced above where the homes ultimately sold.
Recorded sales
| Residence | Layout | Size | Ask | Recorded deed | Deed date | Implied price | $/sf |
|---|---|---|---|---|---|---|---|
| Garden | 2 bed, 2.5 bath duplex | 1,794 sf | $2,695,000 | $2,744,183.75 | October 17, 2025 | $2,695,000 | $1,502 |
| 2 | 2 bed, 2 bath | about 1,017 sf | n/a | $1,929,583.75 | October 15, 2025 | $1,895,000 | about $1,863 |
| 3 | 2 bed | n/a | $1,950,000 | $1,985,587.50 | October 17, 2025 | $1,950,000 | n/a |
| 4 | 2 bed, 2 bath | 1,017 sf | $1,995,000 | $2,031,408.75 | October 16, 2025 | $1,995,000 | $1,962 |
Each deed amount is a round price plus 1.825%, the combined state and city transfer-tax rate below $3 million. The "implied price" column removes that; it is our calculation, not a recorded figure.
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 |
|---|---|---|---|---|---|
| Oct 17, 2025 | 3 | 2 BR · 2 BA · 1,017 sf | $1,985,587 | $1,952/sf | +1.8% |
| Oct 16, 2025 | 4 | 2 BR · 2 BA · 1,017 sf | $2,031,408 | $1,997/sf | +1.8% |
| Oct 15, 2025 | 2 | 2 BR · 2 BA · 999 sf | $1,929,583 | $1,932/sf | +1.8% |
Market read. Most recent trades (2025) cleared a median $1,952/sf (recorded) across 3 sales.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00985-7506; 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.
What would your apartment rent for?
Enter your apartment and I'll send you what it would rent for, from comparable closed leases at 350 Sixth Avenue and nearby.
At the recent median sale of $1.99M (3 sales in the past 24 months, since October 31, 2024), a buyer putting 25% down would pay about $80,156 to close, or 4.0% of the price.
- Mansion tax: $19,856
- Mortgage recording tax: $28,667
- Title insurance: $8,935
- Attorneys, lender, building fees, reserves and filings: $22,698
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
Resale only. The sponsor has sold every home. The October 2025 prices are the baseline for resale asks.
Confirm the abatement. Ask for the current tax bill and the benefit's name, start year and phase-out schedule. A 20-year benefit that steps down will raise carrying costs over time.
Certificate of occupancy. Ask whether the building holds a final certificate of occupancy for the renovation.
Four owners, no staff. Ask how the budget covers the roof, facade and shared systems.
Closing costs. A resale buyer customarily pays the mansion tax: 1% from $1 million to $2 million and 1.25% from $2 million to $3 million. Use the calculators below.
Comparable buildings
If you're considering 350 Sixth Avenue, also look at these Park Slope condominiums:
- 352 Sixth Avenue — four-residence conversion next door, with full-floor homes, a garden duplex and a J-51 benefit
- 353 Sixth Avenue — four-residence condominium nearby on Sixth Avenue, in a late-nineteenth-century building
- 361 Sixth Avenue — four-residence condominium in a prewar building with a garden duplex
- 343 Sixth Avenue — five-residence condominium converted in 2017, with an active J-51 benefit
- 44 Garfield Place — four-residence condominium completed in 2025
- 363 Douglass Street — three-residence condominium converted in 2015
More Park Slope buildings
- 349 22nd Street — 1931 condominium
- 35 Prospect Park West — 1929 co-op by Emery Roth
- 350 Butler Street — 2021 condominium
- 352 Sixth Avenue — 1920 condominium
- 353 20th Street — 2022 condominium by Kutnicki Bernstein Architects
- 353 Sixth Avenue — 1920 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 350 Sixth Avenue?
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646.939.7375 · c.cohen@compass.com