347 Sixth Avenue
347 Sixth Avenue, Brooklyn, NY 11215
Park Slope, Brooklyn
BBL 3009867504 · BIN 3021257
- Year built
- 1920
- 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 347 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.
347 Sixth Avenue is a four-story, roughly 20-foot-wide building on the residential stretch of Sixth Avenue between Fourth and Fifth Streets, a few doors from 353 and 361 Sixth Avenue, two other four-unit condominiums on the same tax block. City records give 1920 as the year built and about 5,200 square feet of floor area. Public records show the building sold in September 2023 for $3.2 million, before the conversion.
The sponsor renovated it into four condominium residences and sold the first two in July and August 2026 at just under $2 million each. One home, a 1,951-square-foot duplex, was still on the market in September 2026, with its ask cut from $2,995,000 to $2,850,000. Those three figures bracket the building: about $1,900 per square foot on the recorded floor-through sale, and about $1,460 per square foot on the current ask for the larger duplex.
Architecture and residences
The Department of Buildings records alteration jobs from February 2024 onward for an "existing 4-family dwelling," split into one job for the basement, first and second floors and another for the third and fourth floors, with mechanical, plumbing and a new combined water service and sprinkler system filed alongside. The engineering firm filed these jobs; no separate architect of record appears in the filings reviewed. The Attorney General record classes the offering as new construction, but the city filings describe a renovation of the existing building with no change in unit count. Confirm with the plan which description governs, because it affects the sponsor's warranty and disclosure obligations.
City land-use data lists the condominium billing lot with 16 residential units. That figure conflicts with the plan, the Department of Buildings and every listing record, all of which give four. Treat it as a data-entry error.
Listing records describe Residence 1 as a two-bedroom, two-and-a-half-bath duplex of 1,951 square feet, with projected common charges of $883 a month and real estate taxes of $787 a month. Another listing record shows a 1,044-square-foot three-bedroom, two-bath floor-through asking $1,995,000 in 2025; the record does not settle which unit it is.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD240195), the plan was submitted June 28, 2024 and accepted May 8, 2025, with Crown 347, LLC as sponsor and four residential units. The total offering price rose from $9,050,000 to $9,690,000, an increase of $640,000, or about 7%. The database shows no effective date and no units sold. Since closings have been recorded, the plan must have been declared effective; the database had not caught up when reviewed in October 2026.
| Residence | Layout | Size | Price | $/sf | Status | Source |
|---|---|---|---|---|---|---|
| 1 | 2 bed, 2.5 bath duplex | 1,951 sf | $2,850,000 ask (cut from $2,995,000) | $1,461 | Available, September 2026 | Listing records |
| 2 | Not confirmed | — | $1,970,000 implied | — | Closed July 9, 2026 | ACRIS |
| 3 | Not confirmed | — | $1,995,000 implied | — | Closed August 12, 2026 | ACRIS |
| 4 | Not confirmed | — | Not published | — | Not determined | — |
Recorded sales
ACRIS records two sponsor deeds:
- Unit 2: $2,005,952.50, deed dated July 9, 2026
- Unit 3: $2,031,408.75, deed dated August 12, 2026
Each recorded figure equals a round price plus 1.825%, the combined state and city transfer tax below $3 million: $1,970,000 and $1,995,000. The usual reason is that the buyer paid the sponsor's transfer taxes, which then count as consideration. The implied prices are our reading of the arithmetic, not figures on the deeds. If the 1,044-square-foot floor-through is one of these two units, it sold at about $1,890 to $1,910 per square foot. 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
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00986-7504; 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.
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What to know if you’re buying
Two units have closed. Contracts now go to a plan under which closings have occurred. Read every amendment with the contract, including the $640,000 in price increases since filing.
Who pays transfer taxes. The recorded deeds suggest buyers have been paying the sponsor's transfer taxes. 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. On a $2.85 million purchase that is about $52,000 in transfer taxes and $28,500 in mansion tax. Use the calculators below to run your price.
Renovation, not new construction. Ask for the certificate of occupancy status and the scope of systems replaced. City filings show new mechanical, plumbing and sprinkler work; confirm what else was replaced, including the roof, windows and facade.
Carrying costs. Listing records put the duplex at about $1,670 a month in common charges and taxes. Confirm against the plan's budget and the current tax bill.
Comparable buildings
If you're considering 347 Sixth Avenue, also look at these Park Slope condominiums:
- 353 Sixth Avenue — four-residence condominium in a late-19th-century building on the same block
- 361 Sixth Avenue — four-residence prewar condominium with a garden duplex, same block
- 343 Sixth Avenue — five-residence condominium converted in 2017, with direct elevator access
- 352 Sixth Avenue — four-residence conversion across the avenue with full-floor homes and private roof space
- 408 3rd Street — 1920 building renovated into four three-bedroom condominiums, sold out
- 121-123 Sixth Avenue — four three-bedroom North Slope condominiums, sold out in 2023
More Park Slope buildings
- 343 Sixth Avenue — condominium
- 344 8th Street — 1931 co-op
- 346 11th Street — 2001 condominium
- 349 16th Street — 1925 condominium
- 349 22nd Street — 1931 condominium
- 35 Prospect Park West — 1929 co-op by Emery Roth
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