291 Sixth Avenue
291 Sixth Avenue, Brooklyn, NY 11215
Park Slope, Brooklyn
BBL 3009717501 · BIN 3020870
- Year built
- 1920
- Type
- Condominium
- Landmark
- No
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at The 291 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.
291 Sixth Avenue is a four-story Park Slope house of about 4,500 square feet that a sponsor gutted, extended to the rear and sold as four condominiums. The four homes closed in 2026 for a combined $6.95 million, about 94 percent of the $7.4 million offering total, and the building is now fully owner-held.
It shows what a four-unit brownstone conversion on a Park Slope avenue block trades for: about $1,450,000 to $1,700,000 for the upper two-bedroom homes and $2.3 million for the garden duplex.
Architecture and residences
The Department of Buildings alteration job, filed in July 2022 and first permitted in February 2023, covers "renovation of 4 family building including rear horizontal enlargement and stair bulkhead to roof." Companion filings cover rear framing and a rear deck, new foundations, sprinklers, plumbing and new mechanical systems throughout. The building stays at four stories and 40 feet with four dwelling units. An initial certificate of occupancy for four dwelling units issued on April 2, 2026, before the first closing, and the final certificate of occupancy on July 2, 2026.
Listing records describe wide-plank engineered hardwood floors, stone counters and backsplashes, individually controlled HVAC, in-unit laundry, heated bathroom floors, video intercom and a common roof deck. Residence 1 is a duplex with a private backyard and a lower level with high ceilings and a walk-out light well. The upper homes are two-bedroom, two-bath homes of about 800 square feet. Listing records say pets are permitted with board approval and financing up to 90 percent is allowed.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD240148), the plan was submitted May 15, 2024, accepted February 13, 2025 and declared effective June 11, 2025, with 291 Sixth LLC as sponsor and four residential units. The total rose from $6,510,000 at filing to $7,400,000, an increase of $890,000, or 13.7 percent. The database records one unit sold, a figure it has not updated since closings. The Attorney General's plan page returned no data on the day this page was written, so the amendments were not reviewed.
Asking prices in listing records from 2025:
| Residence | Beds / baths | Size | Ask | Status seen |
|---|---|---|---|---|
| 1 | 2 / 2.5 (duplex) | 1,445 sf | $2,390,000 | Active, later under contract; common charges $874, taxes $606 a month |
| 2 | 2 / 2 | 806 sf | $1,490,000 | In contract |
| 3 | 2 / 2 | 803 sf | $1,450,000 | In contract December 14, 2025 |
| 4 | — | — | $1,390,000 | Delisted October 1, 2025 |
Recorded sales
| Unit | Price | Deed dated |
|---|---|---|
| 4 | $1,496,828 | April 27, 2026 |
| 2 | $1,700,000 | July 16, 2026 |
| 1 | $2,300,000 | August 27, 2026 |
| 3 | $1,450,000 | September 23, 2026 |
ACRIS names 291 Sixth LLC as seller on all four deeds. Unit 1 closed at about $1,592 per square foot on the listed 1,445 square feet and unit 3 at about $1,806 per square foot on 803 square feet. Two deeds sit well above the last asks seen: unit 2 at $1,700,000 against a $1,490,000 ask, and unit 4 at $1,496,828 against $1,390,000. Either the prices rose after those listings or the listing unit numbers do not match the deeds. Confirm against the contract before using either as a comparable. 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 |
|---|---|---|---|---|---|
| Sep 23, 2026 | 3 | 2 BR · 2 BA · 803 sf | $1,450,000 | $1,806/sf | +0.0% |
| Aug 27, 2026 | 1 | 2 BR · 2.5 BA · 1,445 sf | $2,300,000 | $1,592/sf | -3.8% |
| Jul 16, 2026 | 2 | 2 BR · 2 BA · 806 sf | $1,700,000 | $2,109/sf | +14.1% |
| Apr 27, 2026 | 4 | 2 BR · 2 BA · 803 sf | $1,496,827 | $1,864/sf | +7.7% |
Market read. Most recent trades (2026 to date) cleared a median $1,835/sf (recorded) across 4 sales. Median listing discount -3.8% over ask.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00971-7501; 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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At the recent median sale of $1.6M (4 sales in the past 24 months, since October 31, 2024), a buyer putting 25% down would pay about $67,552 to close, or 4.2% of the price.
- Mansion tax: $15,984
- Mortgage recording tax: $23,077
- Title insurance: $7,193
- Attorneys, lender, building fees, reserves and filings: $21,298
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
Every purchase is a resale. The sponsor has sold out. Use the four recorded deeds as the baseline.
A gut renovation, not new construction. The structure dates to about 1920. The filings replaced systems and enlarged the rear, but ask for the engineer's sign-offs and any open items on the façade and roof.
Small-building governance. Four owners run the condominium. Ask about the reserve fund, insurance and how roof and façade costs are shared.
Carrying costs. Listing records show common charges of $874 and taxes of $606 a month on the duplex. Confirm current figures with the managing agent and the Department of Finance.
Closing costs. In a resale the buyer pays the state mansion tax of 1% at $1 million and above, plus title and recording costs. Use the calculators below.
Comparable buildings
If you're considering 291 Sixth Avenue, also look at these small Park Slope condominiums:
- 132 Sixth Avenue — 19th-century building converted into five two-bedroom condominiums, plan accepted July 2026
- 121-123 Sixth Avenue — two 1880 buildings converted into four three-bedroom condominiums, sold out in 2023
- 643 Baltic Street — townhouse condominium converted in 2025 with garden and roof-terrace layouts
- 668 Baltic Street — three-residence condominium enlarged to four stories
- 222 16th Street — 32-residence new construction asking about $1,400 to $1,600 per square foot
- 118 Sterling Place — 16-residence prewar condominium conversion in the North Slope
More Park Slope buildings
- 279 First Street — 1921 co-op
- 279 Prospect Avenue — 2004 condominium
- 288 Seventh Street — 1931 condominium
- 292 Garfield Place — 1891 co-op
- 295 Sixth Avenue, 295 Sixth Avenue · Park Slope — co-op
- 299 13th Street — 1920 co-op
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 The 291?
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646.939.7375 · c.cohen@compass.com