- Year built
- 1920
- Type
- Condop
- Units
- 24
- Floors
- 4
- Landmark
- No
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 636 Warren 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.
This is one of the older condominiums on the Fourth Avenue corridor. In 1987, three decades before 613 Baltic Street was completed at the Baltic Street end of the same block, a sponsor took three four-story walk-ups at the Warren Street corner and sold them as 24 condominium apartments. Brooklyn conversions of that decade were usually co-ops, so the condominium form was unusual then and is still uncommon for a building of this size and age.
The sponsor finished quickly. The declaration was recorded in March 1987 and all 24 apartments had been deeded to individual buyers by January 1988. The building has had no sponsor since then. That gives it a long, complete resale record: 38 years of owner-to-owner deeds, including a run of bank sales and foreclosures in the early 1990s that is typical of conversions from the late 1980s.
The corner is where three neighborhoods meet. It sits at Park Slope's northern end, with the Boerum Hill and Gowanus blocks directly across Fourth Avenue. Fourth Avenue has since filled in with new elevator condominiums, including the 11-story building at the other end of this block. Compared with those, this building offers small apartments in low walk-up buildings, owned outright as condominium units.
Architecture and unit composition
Each of the three buildings has eight apartments on four floors, two per floor. The layout shows up in ACRIS unit designations running 1L and 1R through 4L and 4R at each address. The corner building at 99 Fourth Avenue, which carries the 636 Warren Street address, has somewhat larger upper-floor apartments than its two neighbors, per the Department of Finance roll. At every address the first-floor apartments are the largest on the roll. Whether that extra space is on one level or runs into the cellar or rear yard should be checked against the declaration's floor plans for the specific unit.
The building has no elevator, doorman or garage. There is no commercial space on the Fourth Avenue frontage: PLUTO records the whole building area as residential.
A note on the city's data. PLUTO lists one address, 99 Fourth Avenue, for three buildings. It gives a construction year of 1920 that the Department of Finance contradicts for 23 of the 24 units, and a 1986 alteration year that most likely reflects the sponsor's conversion work. Treat all of these as approximate. The unit count of 24 is correct.
Building operations
Tax history. The city's J-51 records show a benefit on all 24 units starting in the 1987/88 tax year. It combined a 90 percent abatement with an exemption that was first carried at 12 years and later at 14. The exempt amounts were gone after 2001/02 and the abatement pool was used up in 2002/03. The current exemption roll, 2020/21 through 2026/27, shows no J-51 or 421-a. Apartments pay full Class 2 condominium taxes, apart from personal exemptions some owners hold.
Capital work. The public record here is thin. The only Department of Buildings job in the open-data file for the corner building is a 2011 alteration, and there are none for 101 or 103. Ask the managing agent for the reserve balance, the dates of the last roof and façade work, and any planned or recent assessment. Buildings this old and this small usually pay for capital work through assessments.
Zoning and air rights. PLUTO maps the lot C4-4D with a maximum residential FAR of 6.02, against the 3.28 that is built. On paper, that leaves a large amount of unused floor area. In practice, redeveloping the site or selling the air rights would need action by the condominium under its declaration and by-laws, with 24 separate owners and their lenders involved. Treat it as a long-term possibility, not something to add to an apartment's value.
Recent sales
636 Warren Street sits in the Park Slope and Boerum Hill condominium resale market, priced per square foot. It competes with the smaller walk-up co-ops nearby more than with the Fourth Avenue new-construction buildings, which bring elevators, amenities and in several cases active tax abatements. Within the building, the large first-floor apartments and the roughly 650-to-750-square-foot upper-floor apartments are two different products, and they price differently. Two sales have closed in the last 24 months. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
Recent closings 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 |
|---|---|---|
| Apr 28, 2016 | 1R | $995,000 |
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00937-7501) 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
Confirm which building and which unit. One billing lot covers three buildings, and the unit designations repeat at each address. Match the tax lot, the address and the unit to the declaration before contract.
There is no abatement to lose. The J-51 benefit ran out more than twenty years ago, so the current tax bill is the real one.
Ask for the capital file. Little capital work shows up in the public record. The reserve, recent assessments and the condition of the roof and façade are the main things to check.
Walk-up, and a condominium. There is no board admission process of the kind a co-op has. Confirm with the managing agent whether the declaration gives the board a right of first refusal, and what it says about leasing and pets.
What to know if you’re selling
Sell the tenure. A condominium in a prewar walk-up is rare in this part of Brooklyn. Buyers who want an older building without co-op board approval, subletting limits or financing limits have few choices, and this is one.
Price against like-for-like. The right comparables are other condominiums in older walk-up buildings and the small co-ops around them, not the new buildings on Fourth Avenue.
Comparable buildings
If you're considering 636 Warren Street, also evaluate:
- Baltic Park Slope (613 Baltic Street): the 2017 elevator condominium at the Baltic Street end of the same block
- 11 Sterling Place (Sterling Court): a 1986 Park Slope condominium conversion from the same era
- 100 Sterling Place: a 1990 North Slope condominium with no remaining tax abatement
- 145 Park Place: a North Slope condominium whose J-51 abatement has also fully expired
- The Mill, 376 President Street: a 1988–89 condominium conversion in Carroll Gardens with a similar J-51 history
- 610 Warren Street: a 2017 condominium on the same street, with an active 421-a schedule
- 243 Fourth Avenue (Parlour): a new-construction condominium on the Park Slope stretch of Fourth Avenue
- The Presidential, 759 President Street: a 1984 Park Slope conversion held as a co-op, for buyers comparing tenure
More Park Slope buildings
- 560 Carroll Street — 2010 condominium
- 569 Carroll Street (Lumber Yard Condominium), 565 and 569 Carroll Street — 2003 condominium
- 575 Fourth Avenue — 2018 condominium
- 64 Seventh Avenue — 1889 condop
- 675 Sackett Street (Park Slope Terrace) — 2003 condominium
- 75 Prospect Park West — 1920 co-op
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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