343 Sixth Avenue
343 Sixth Avenue, at Fourth Street, Park Slope, Brooklyn
BBL 3009837506 · BIN 3021120
- Type
- Condominium
- Landmark
- No
- Amenities
- Elevator, central air conditioning, in-unit laundry and private outdoor space with some homes
Every recorded sale at this building, 2006–2026
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf
- $2,309
- Listing discount
- 2.0%
- Recorded sales
- 10
- On record
- 2006–2026
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A Private Pricing Opinion — what your apartment at 343 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.
About the building
343 Sixth Avenue is a five-residence condominium at Fourth Street, created by renovating an existing apartment building. Shuji Suzumori was architect of record for the conversion, which reduced the previous eight-dwelling arrangement to five homes. DNA Development undertook the project, and DOB signed off the work in May 2017. Apartment closings began the following month.
The configuration combines two duplexes at the base with broad full-floor homes above. The upper apartments have direct elevator access and include three-bedroom plans with a den and three bathrooms. The top-floor home adds a private roof terrace, while the lower duplexes offer townhouse-style internal circulation and garden-level outdoor space. Central air conditioning and in-unit laundry serve the residences; gas fireplaces appear in upper homes.
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 |
|---|---|---|---|---|---|
| Aug 7, 2026 | 4 | 3 BR · 3 BA · 2,165 sf | $4,999,999 | $2,309/sf | -4.8% |
| Oct 4, 2024 | 2 | 4 BR · 3 BA · 2,165 sf | $3,825,000 | $1,767/sf | -0.6% |
| Jan 4, 2022 | 1A | 3 BR · 3 BA · 2,035 sf | $3,050,000 | $1,499/sf | +7.0% |
| Aug 3, 2017 | 1A | 3 BR · 2,035 sf | $2,540,534 | $1,248/sf | +1.8% |
| Jul 26, 2017 | 4 | 3 BR · 2,165 sf | $3,725,000 | $1,721/sf | off-mkt |
| Jul 20, 2017 | 2 | 3 BR · 2,165 sf | $3,375,000 | $1,559/sf | -3.4% |
| Jun 26, 2017 | 3 | 3 BR · 2,165 sf | $3,400,000 | $1,570/sf | -4.2% |
| Jun 13, 2017 | 1B | 2 BR · 1,706 sf | $2,112,869 | $1,238/sf | +1.8% |
Market read. Most recent trades (2026) cleared a median $2,309/sf across 1 sale. Median listing discount 2.0% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.
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 3-00983-7506) 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.
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
The active J-51 benefit is a material part of carrying costs. Its fourteen-year term began several years after the conversion, so the remaining benefit period should be measured from 2021, not from the first apartment closings.
Comparable buildings
- 220 Park Place — A small historic condominium with a similarly limited ownership group.
- 153 Lincoln Place — A larger low-rise condominium in a nineteenth-century building.
- 64 Seventh Avenue — Another historic condominium for buyers considering the northern part of Park Slope.
- Timber House — A newer, larger boutique condominium with a purpose-built structure.
More Park Slope buildings
- 327 4th Street — 1920 co-op
- 340 11th Street — 1991 condominium
- 343 4th Avenue (Novo), 343 Fourth Avenue — 2006 condominium
- 344 8th Street — 1931 co-op
- 346 11th Street — 2001 condominium
- 349 16th Street — 1925 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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