123 Sixth Avenue
121-123 Sixth Avenue, Brooklyn, NY 11217
Park Slope, Brooklyn
BBL 3009420007 · BIN 3019079
- Year built
- 1880
- 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 123 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.
123 Sixth Avenue is a four-residence condominium made from two adjoining 1880 buildings on Sixth Avenue in the North Slope. Before the conversion, the Department of Buildings describes the property as a mixed-use building with a funeral home and one apartment. The sponsor combined 121 and 123 Sixth Avenue into a single building on a 40-foot-wide lot and converted it to four three-bedroom homes, each a full floor.
The four homes sold within six weeks in the fall of 2023 for a combined $11,913,564, about $54,000 above the offering total. That puts the building at roughly $2.75 million to $3.2 million per home, with the one parlor-floor sale that has a published size at about $1,890 per square foot.
Architecture and residences
The Department of Buildings job, first permitted in December 2021, covers "conversion and change in use of existing mixed use building consisting of funeral home and one residential unit to residential class A dwelling units only," and combines the two buildings under one building number. An earlier 2021 application described a gut renovation with a new penthouse addition, raising the height from 41 to 51 feet; it was withdrawn and refiled under the current system. The certificate of occupancy for four dwelling units was first issued August 14, 2023 and made final January 17, 2024.
Listing records describe a brownstone facade with a bold cornice and tall arched windows. Inside, the four three-bedroom homes have Pella Reserve double-hung windows, chevron-pattern hardwood floors, decorative fireplaces, kitchens with large islands, custom Marfa cabinetry, Cambria quartz counters, Viking and Liebherr appliances, Hansgrohe fixtures, Toto toilets and washer-dryers. Listing records say every home has private outdoor space, either a backyard or a roof deck with a built-in grill; confirm which homes carry which in Schedule A. The building has a virtual doorman system and stroller and bike storage.
Because the lot sits in a historic district, the facade, windows facing the street and any rooftop changes need Landmarks Preservation Commission approval.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD220069), the plan was submitted March 21, 2022 and accepted January 6, 2023 at an initial total of $11,040,000, with JSQS4 LLC as sponsor and four residential units. The total now stands at $11,860,000, an increase of $820,000, or 7.4 percent. The record shows no effective date and no units sold, figures it has not updated since the closings. The amendment text was not re-read for this page.
Listing records priced the homes "from $2,750,000," with a 10 percent minimum down payment and financing up to 90 percent.
Recorded sales
| Residence | Price | Deed dated | Notes |
|---|---|---|---|
| Unit 4 | $2,750,000 | September 6, 2023 | |
| Unit 3 | $2,988,564 | September 26, 2023 | |
| Unit 2 | $2,975,000 | October 4, 2023 | Matches the parlor home: 3 bed, 1,572 sf, about $1,893/sf, per listing records |
| Unit 1 | $3,200,000 | October 13, 2023 | Listing records show the garden home closing at $3,500,000 in November 2023; ACRIS records $3,200,000 |
The garden home is listed at 2,950 square feet, a figure that likely includes lower-level space. Listing records for the penthouse homes show common charges of about $519 a month and real estate taxes of about $14,000 a year. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
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What to know if you’re buying
Every home is a resale. The sponsor sold out in 2023. Use the recorded deeds as the baseline, and confirm which recorded unit number matches which floor.
The garden price conflict. Brokerage records and ACRIS disagree by $300,000 on the garden home. ACRIS is the recorded figure.
Landmark rules. Exterior work, including windows and roof structures, needs commission approval.
Carrying costs. Listing records show taxes near $14,000 a year and common charges near $519 a month on the penthouse homes. No tax abatement was found in this review; confirm the current bill with 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 123 Sixth Avenue, also look at these small Park Slope and Prospect Heights condominiums:
- 275 Sixth Avenue — four-residence condominium converted in 2025 from a limestone row house
- 408 3rd Street — four three-bedroom homes in a renovated 1920 building, sold out in 2022–23
- 357 4th Street — four-residence townhouse condominium converted in 2007
- 149 Prospect Place — historic-district rowhouse converted to five residences
- 220 Park Place — 1880s Prospect Heights row house condominium, a few blocks east
- 113 Sterling Place — Sterling Atrium, two 1920 non-residential buildings converted to a co-op on the same block
More Park Slope buildings
- 118 Sterling Place — 1920 condominium
- 12 Lincoln Place — 1918 co-op
- 120 Prospect Park West — 1899 co-op
- 125 Prospect Park West — 1916 co-op
- 130 Eighth Avenue (814 Carroll Street) — 1950 co-op
- 132 Sixth Avenue — 1876 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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646.939.7375 · c.cohen@compass.com