229 9th Street (Luna)

The building occupies an 8,000-square-foot lot with eighty feet of frontage and rises nine stories to ninety-two feet — 33,354 square feet, all of it residential, on a split-zoned lot. The design is organized around arched window openings and a stepping terrace profile, which is the vocabulary that has come to define the current Gowanus cycle and which, in a market whose older stock is defined by small punched windows, is a practical advantage rather than a stylistic one.

Composition runs from a garden duplex at grade through six- and seven-unit floors on two through six, then five penthouses across floors seven, eight and nine. At 33,354 square feet across thirty-nine homes the average gross area is roughly 855 square feet, which fairly describes the inventory: a one- and two-bedroom building with a small set of larger penthouse-level homes at the top. Apartments carry offering-plan square footage, so dollars per square foot is a documented metric here rather than a derived one.

Inside the building the variables are floor, exposure, and the size and orientation of the private terrace — the terrace stepping means outdoor space is distributed very unevenly, and the difference between a shallow balcony and a wrapped upper terrace is the single largest driver of value between two otherwise similar apartments. Confirm which rooms face the street. Ninth Street carries traffic to the Gowanus Expressway. Confirm, too, whether a deeded parking unit conveys; twelve exist and they are separate tax lots.

One line item to check on the third floor: Department of Buildings filings in August 2026 cover the merger of apartments 303 and 304, so the floor plate there differs from the plan as offered.

Luna operates as a resident-governed condominium with an elected board and professional management; purchaser review runs through a right of first refusal rather than a cooperative board interview.

The building is roughly four years past its final certificate of occupancy and six from its first temporary one, which is precisely the window in which construction-quality questions surface and the first façade inspection cycle arrives. At thirty-nine residential units the denominator is small: a mechanical replacement, a roof, or an amenity-level capital item lands hard per unit. Ask for the reserve balance, the last three years of audited financial statements, the current capital plan and any assessment history — and ask them before making an offer rather than during attorney review.

The building exceeds 25,000 square feet of floor area, which places it inside the city's building-emissions and energy-benchmarking regimes. Ask the managing agent to state the Local Law 97 position in writing.

Two neighborhood-level items belong in the file. A city pre-kindergarten facility has been under construction on the same block at 197 Ninth Street under School Construction Authority filings dating from 2021 — relevant both to the block's construction noise history and to what the streetscape looks like when it is finished. And the 2021 rezoning that placed this lot in the Special Gowanus Mixed Use District also set new envelopes on the blocks around it; nothing across the lot line is protected, and a buyer should look at their windows and ask what can rise beside them.

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 $1,387/sf (recorded) across 3 sales. Median listing discount -1.3% over ask.

Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01003-7505; 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.

Get the documents we do not hold. No offering plan for this building is on file with us. Ask the managing agent for the plan and all amendments, the current house rules, the pet and leasing policies, the last three years of financial statements, the reserve balance and capital plan, and any board-imposed transfer fee, working-capital contribution or move fee.

Underwrite the taxes first. The roll shows no exemption on these unit lots and no phase-out ahead; check each unit's bill. Run the same exercise on any Fourth Avenue or Gowanus alternative you are considering; total cost depends on each unit's charges, taxes, financing and assessments.

Buy the terrace. With thirty-nine homes and no repeated line above the sixth floor, there is no such thing as a generic comparable here. The outdoor space is the differentiator.

Document the flood and Superfund positions rather than assuming them. Both map checks come back favorably at this lot. That is worth having in writing before a lender or a nervous buyer raises it; it does not replace a review of the building's flood history, insurance and any environmental reports.

Lead with the amenity package and the terrace. A thirty-nine-unit building with a roof terrace, fitness center, party room, playroom and garage is a rare product in Gowanus, and it draws a buyer who is otherwise shopping Park Slope new development.

Handle the tax line proactively. Present current full carrying costs and the reviewed absence of a building-wide exemption. Assessments, rates and bill-level benefits can change; neither future taxes nor a buyer premium for certainty is established.

Assemble the resale comparable set yourself. The sponsor sellout dominates the public record at this address and will misprice your apartment in both directions if left unexplained.

If you're considering 229 9th Street, also evaluate:

• 251 7th Street (The Argyle) — the most-traded address in Gowanus, at 7th Street and Fourth Avenue; the older, larger, now-unabated corridor comparison
• 575 Fourth Avenue — the newer large Fourth Avenue condominium; the closest current-cycle corridor alternative
• 500 4 Avenue — the 156-unit 2010 amenity condominium on the same avenue
• 243 4th Avenue (Parlour) — nineteen half- and full-floor homes; the small-building, large-apartment, also-unabated comparison
• 58 Saint Marks Place — 100-unit new-development condominium at the Gowanus–Boerum Hill edge
• Sackett Union (291 Union Street) — Carroll Gardens–Gowanus new development closer to the canal
• 345 Carroll Street — 32-unit boutique condominium toward the canal
• 10 Nevins Street (The Brooklyn Grove) — the large full-amenity condominium north of the canal
• 445 5th Avenue (The Slope on Fifth) — new-construction Park Slope condominium one avenue east
• 205 12th Street — six-unit South Slope condominium; the boutique-scale contrast