- Year built
- 1916
- Type
- Cooperative
- Units
- 12
- Floors
- 4
- Landmark
- Designated
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 459 12th Street 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.
459 12th Street is a small conversion from the first wave of South Slope conversions. A two-lot-wide garage built around 1916 became a 12-apartment cooperative in 1979. That was two years before the same sponsor, Millwich Enterprises, began converting the Ansonia Storage Warehouse at 443 12th Street a few doors west. Together the two buildings show the pattern that turned this stretch of 12th Street from light industry into housing: vacant commercial buildings, bought cheaply, converted under J-51 and sold as co-op shares.
The building's form reflects its first use. It sits on a 50-foot lot, twice the width of a typical Slope rowhouse, and has a Colonial Revival brick front designed by Thode & Harvie. Behind the front is a floor plate built for vehicles and workshops, not for rooms, which sets it apart from the brownstone co-ops around it.
Since 2012 it has been inside the Park Slope Historic District Extension. That protects the streetscape and adds a layer of approval to any exterior work.
Architecture and unit composition
The LPC records the building as a brick garage and shop with stone trim, c. 1916. The 1979 conversion produced 12 apartments. The offering plan priced every apartment the same at launch, and amendments later repriced a few apartments individually. That suggests the layouts were broadly similar. ACRIS designations use four lines, A through D, and the plan attaches exclusive use of the garden to apartment 1B.
Layouts have changed since 1979. DOB records a general-construction alteration with structural work, signed off in 2019. Ask for the current floor plan and confirm that any alterations were approved by both the board and the LPC.
Building operations
This is a small cooperative with no staff documented in the records we reviewed. DOB records show a gas boiler replacement permitted in 2012. The original financing was a ten-year mortgage with a balloon payment at maturity, and ACRIS shows the corporation's recorded agreements since. The current underlying mortgage, reserves and any assessment have to come from the current financial statements. Nothing on file is recent enough to describe them.
The J-51 benefit that supported the conversion's carrying costs has expired. The building now pays full taxes, apart from exemptions individual shareholders hold.
Policy framework
The proprietary lease on file is the plan-era form. Subletting needs a board resolution or written consent, and the lease gives the directors unlimited discretion to refuse. The board may have adopted more detailed rules since. The documents on file do not address pets, pied-à-terre use, LLC or trust purchases, financing limits or a flip tax. Get each of these from the managing agent.
Recent sales
459 12th Street trades as small South Slope prewar co-op stock and is priced per room. Condition, the garden apartment, and how far a unit has been renovated drive the spread within the building. Since 2004, ACRIS records share transfers to unrelated buyers in at least nine of the 12 apartments. With 12 apartments, only one or two trade in a typical year, so read any single sale in context.
Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Recent transfers at this building, sourced from NYC Department of Finance records. Apartment-level detail (line, condition, asking-price context) verified upon consultation request.
| Date | Unit | Price |
|---|---|---|
| Jul 21, 2025 | 1A | $1,500,000 |
| Oct 17, 2022 | 1A | $1,465,000 |
| Aug 12, 2022 | 3D | $1,765,000 |
| May 20, 2020 | 2D | $1,110,000 |
| May 8, 2020 | 2B | $1,150,000 |
| Dec 7, 2018 | 3D | $1,400,000 |
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-01096-0043) and verified listing data. Apartment-level facts (line, condition, asking-price context) curated and cross-verified by The Roebling Team research desk. Not all transactions cross-verify with ACRIS records — sponsor and LLC purchases sometimes record at stipulated values rather than market price.
Buying here? Co-op closing costs typically run 2 to 3% of the price. See NYC co-op and condo closing costs, line by line.
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What to know if you’re buying
Budget for Landmarks review. Window replacement or any other change visible from 12th Street needs LPC approval in addition to the board's.
Get current financials. With 12 shareholders, one capital project can mean an assessment. Ask for the last three years of statements and the current mortgage terms.
Confirm the rules in writing. Financing limits, sublet terms and any transfer fee are not documented on file. Get them before you bid.
What to know if you’re selling
Prepare alteration paperwork. Buyers and their lenders will ask whether prior renovations were approved by the board and the LPC. Have the approvals ready.
Confirm transfer costs early. Ask the managing agent whether a flip tax applies and what the transfer fees are, so your net figure is accurate.
Comparable buildings
If you're considering 459 12th Street, also evaluate:
- 443 12th Street (Ansonia Storage Warehouse), the same sponsor's 1981–82 warehouse-to-loft conversion on the same block; the larger version of the same idea
- 420 12th Street (Ansonia Court), the Ansonia Clock Company factory across the street, converted to a 70-unit cooperative in 1982
- 444 12th Street (Ansonia Muse), an 1881 factory across the street converted to condominium lofts; the fee-simple alternative on the block
- 270 5th Street (The Milk Factory), an industrial-to-residential cooperative in the North Slope
- 759 President Street, a 1984 conversion of a former hospital into a cooperative
- 86 Prospect Park West, a small 1978 walk-up co-op conversion; the conventional residential alternative
- 10 Montgomery Place, a walk-up cooperative inside the historic district
More Park Slope buildings
- 443 12th Street (Ansonia Storage Warehouse) — 1909 co-op
- 444 12th Street (Ansonia Muse) — 1881 condominium
- 445 5th Avenue (The Slope on Fifth), 445 Fifth Avenue — 2025 condominium
- 500 4 Avenue, 500 Fourth Avenue — 2010 condominium
- 560 Carroll Street — 2010 condominium
- 569 Carroll Street (Lumber Yard Condominium), 565 and 569 Carroll Street — 2003 condominium
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Park Slope.
The full playbook — what goes in the package, how boards read your financials, the interview, and the timeline — plus sample cover, reference, and personal letters you can adapt.
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 459 12th Street?
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