503 Clinton Avenue

A registered architect filed the alteration in February 2016. The Department of Buildings approved it in August 2016, the permit issued in November 2016, and the job was signed off on October 10, 2024. The filing takes the building from 45 feet to 55 feet through a vertical enlargement of about 650 square feet, and from 4 to 8 dwelling units. Zoning floor area rises from 7,800 to 10,513 square feet. INM Architects filed the sprinkler system in 2023, and that permit issued in July 2024. PLUTO records 7,985 square feet of building area on a 2,500-square-foot lot.

The homes are numbered 1A and 1B through 4A and 4B. Per the sponsor's listing records, 1A and 1B are parlor-level duplexes with garden access (1B, a two-bedroom, has a private garden of about 501 square feet), the middle floors hold two-bedrooms, and the top floor has a three-bedroom duplex with a private terrace (4A, about 1,270 square feet) and a two-bedroom with a private roof deck (4B, about 848 square feet). Common charges in listing records run from about $497 to $691 a month on the lower homes and about $1,072 on 4A. One listing record called it ten residences. The plan, the alteration filing and the tax lots all give eight.

Because it is a conversion, the building keeps its 1930 structure, masonry and floor-to-floor heights. Systems, layouts and finishes are new.

Per the offering plan filed with the New York State Attorney General (plan CD250104), the sponsor, 503 Clinton Avenue, LLC, submitted the plan on April 2, 2025. The Attorney General accepted it on August 19, 2025, and the sponsor declared it effective on November 14, 2025. The total offering price was $10,310,000, unchanged from initial to current. The Attorney General's online record returned no data in October 2026, so these figures come from the Attorney General's plan database extract, and the amendments were not reviewed. The extract still lists two units sold.

The average is about $1,133,000. The two top-floor homes recorded at about $1,299 per square foot (4A) and $1,268 (4B), our arithmetic on listing-record sizes. 4A sold at its $1,650,000 ask. 4B was listed at $1,100,000 in November 2025 and recorded at $1,075,000. 1B's deed of $1,257,539 is exactly 1.825% above its $1,235,000 listing price, consistent with the sponsor's transfer taxes grossed up into the deed; the other seven deeds are round figures. Sizes for the other six homes were not confirmed from an opened listing record. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.

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.

Market read. Most recent trades (2026 to date) cleared a median $1,240/sf (floor-adjusted) across 8 sales. Floor-adjusted means each sale is restated to a constant mix of floors, so the figure can differ from the plain median of the sales listed above. Median listing discount 1.1% from the last ask — a recurring negotiation gap worth pricing into any offer or listing strategy.

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-02011-7505; 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.

Resales only. All eight sponsor units have closed. On a resale the seller usually pays the transfer taxes. The buyer pays the 1% mansion tax at $1 million and above.

Conversion diligence. The building's structure is from 1930. Ask the managing agent for the engineer's condition report from the plan, the facade inspection status, and the reserve fund balance.

The eight-year permit. Ask why the job ran from 2016 to 2024 and whether any work remains open or was signed off under an amended scope.

Carrying costs. Common charges of about $497 to $691 a month in listing records are modest. No abatement was confirmed. Get the current tax bill.

The sponsor prices are recent and below plan. Buyers will see eight closings from early 2026 at 12% below the plan total. A resale priced off the plan schedule instead of the deeds will look high.

If you're considering 503 Clinton Avenue, also look at these Clinton Hill and nearby condominiums:

• 500 Waverly Avenue — 48-unit GKV-designed condominium at Fulton Street on the same block
• 258 St. James Place — The James, eight new-construction residences that sold out in 2024 and 2025
• 545 Washington Avenue — Isabella, a 63-unit condominium near Fulton Street
• 555 Washington Avenue — Cathedral Condominiums, a former school converted to 53 homes
• 124 Washington Avenue — 122 Washington Lofts, a former industrial building converting to 15 residences
• 415 Degraw Street — six-residence conversion of a 1931 building in Gowanus, a close structural match