443 12th Street (Ansonia Storage Warehouse)

The building is load-bearing brick, five stories over a full cellar, in the Romanesque Revival manner the LPC assigns. It was built for heavy storage, which shows in the generous heights: 11 feet 6 inches floor to floor above the ground floor and 14 feet at the ground floor, per the conversion architect's report. Listing records describe beamed ceilings of about 11 feet, large windows, exposed brick and hardwood floors. Those are the features buyers come for.

The offering plan fixed the layout that still defines the building. There are eight duplexes on the basement and first floor, with double-height space and — in the original plan — kitchens on the lower level, and seven apartments on each of floors two through five. Most apartments were laid out as open lofts with no enclosed rooms other than bathrooms. Forty years of renovation have turned many of them into conventional bedroom layouts, and the plan itself warns that apartments may have been altered from the typical floor plan. Inspect each apartment, and treat any bedroom count as current condition rather than original design.

The roof is the other asset. It is common space with grills and planters maintained by a shareholder gardening committee. Two top-floor apartments, 5B and 5E, have exclusive rights to defined portions of the roof under the original offering plan, reached through restored scuttle hatches. The house rules say plainly that dormers and skylights belong to the corporation, and that shareholders with structures next to their apartments have no rights to the surrounding roof.

This is a small, hands-on cooperative. It has a professional managing agent but no resident superintendent — the house rules say so and ask shareholders to share cleaning, snow and trash duties. Move-ins and renovations follow detailed written rules. Renovations fall into four categories with monthly fees and deposits. Every exterior change — windows, dormers, anything visible from 12th Street — requires Landmarks approval on top of the board's.

The capital record is that of a masonry building more than a century old. DOB filings show a burner and gas conversion in 2003, a boiler replacement in 2008, stucco on the east wall in 2010, and façade and roof repairs filed in 2017. Board communications on file from 2021 refer to a recently completed elevator upgrade. They also record water getting into the rear lower-level apartments and the boiler room during the 2021 remnants of Hurricanes Henri and Ida, followed by waterproofing of the lower rear wall and plans for sump pumps in the basement and elevator pit. Dormer, skylight and upper-façade sealing were identified as phased projects. At five stories the building sits below the six-story threshold of the city's façade-inspection program (FISP/Local Law 11).

Underlying mortgage and reserves. The corporation's current mortgage dates from May 30, 2017, when the existing loan was consolidated with Astoria Bank under a recorded $1,660,000 agreement. Per the 2021 shareholder tax letter on file, outstanding principal was about $655 per share at December 31, 2021 — roughly $1.3 million across the plan's 2,000 shares — and was paying down by about $95,000 a year. The maturity date is not in the documents we reviewed. Board communications from 2021 show a savings reserve in the mid-five figures, held alongside operating funds and a bank line of credit. That is modest for a masonry building of this age. Get the current audited financial statements, the mortgage maturity and the reserve balance before pricing an apartment here.

Board approval: All sales require the board's prior written approval. The package includes two years of tax returns, employment and personal references, the mortgage commitment, recent pay stubs, asset statements, a credit report and the contract of sale. An interview is scheduled no sooner than two weeks after the package is complete, and the decision is delivered in writing. All maintenance, assessments and late charges must be current before the board approves a sale, sublet or refinance.

Subletting: Board approval required. The shareholder must have lived in the building for 12 consecutive months. Sublets are limited to 24 months on the board's form, no more than two apartments may be sublet at once, requests are handled first come, first served, and a $1,500 fee applies.

Pets: Up to four without prior approval, no more than two dogs and three cats. Dogs expected to exceed 50 pounds need board approval.

Use: No commercial use. The house rules define that as delivering goods or services to clients on site, or receiving clients regularly.

Proprietary lease: The term was extended to September 30, 2069 by shareholder vote on November 16, 1998.

Transfer fee: Collected on sales per board communications on file. Confirm the formula with the managing agent.

Financing, pied-à-terre, LLC and trust ownership, gifting, co-purchasing: Not addressed in the documents on file. These must come from the managing agent.

Recent sales

Recent transfers 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 $1,097/sf (floor-adjusted) across 3 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 1.4% 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 3-01096-0050). 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 on co-ops is not officially recorded, figures shown are approximate.

Get the financial statements and the mortgage terms. The underlying loan dates from 2017 and was paying down by about $95,000 a year in 2021. Find out when it matures and what a refinancing would do to maintenance. A small reserve in a building this old deserves a direct question about planned assessments.

Ask about water. The rear lower-level apartments took water in the 2021 storms. If you are looking at a basement/first-floor duplex, ask what was repaired, whether the sump pumps were installed, and how the apartment fared in later storms.

Know what the lease permits you to change. Enclosing a sleeping loft, moving a kitchen or replacing windows falls in the house rules' higher renovation categories, and any exterior change needs Landmarks approval. Price the renovation you want only after confirming it can be approved.

Plan for the sublet cap. No more than two apartments may be sublet at once, only after 12 months of residence and for no more than 24 months. If you might need to rent the apartment out, this building is a poor fit.

Expect the name confusion. The corporation is Ansonia Storage Warehouse Corp., formerly 443-47 12th Street Housing Corporation, and the lot is indexed at 445 12th Street. Your lender and title company will ask.

Tell the true history in two sentences. A 1909 Ansonia Clock Company warehouse by Parish & Schroeder, converted to lofts in 1981–82 with a residential certificate of occupancy. Do not call it the clock factory — that is across the street, and informed buyers know the difference.

Correct the 1960 date. The Department of Finance year is wrong, and buyers will find it. The offering plan and the LPC both date the building 1909.

Have the board package ready early. A complete package moves faster here, because no interview is scheduled until everything is in. Get the transfer fee figure and the managing agent's financial summary in hand before you set the price.

Lead with the volume and the roof. Eleven-foot beamed ceilings, big windows and a shared roof deck with long views are specific features to compare with nearby brownstone floor-throughs. If your apartment is 5B or 5E, the exclusive roof area is the headline.

If you're considering 443 12th Street, also evaluate:

• 420 12th Street (Ansonia Court), the Ansonia Clock Company factory across the street, converted to a 70-unit cooperative in 1982; the same history at twice the scale
• 444 12th Street (Ansonia Muse), the c.1881 Ansonia factory building across the street, converted to a loft condominium in 2001–02; the condominium alternative on the same block
• 28 Old Fulton Street (The Eagle Warehouse), an 1890s Brooklyn warehouse converted to a cooperative; the borough's best-known peer in the format
• 8 Old Fulton Street (Brooklyn City Railroad Company Building), an 1860–61 commercial building in Fulton Ferry, now a cooperative
• 423 Atlantic Avenue (The Ex-Lax Building), an industrial conversion in Boerum Hill; the same loft buyer in a different neighborhood
• 145 Park Place (Park Place Condominiums), a Park Slope conversion of a non-residential building to condominium
• 230 Park Place, a 1937 Prospect Heights co-op; the conventional prewar co-op alternative for the same buyer