701 Union Street
701 Union Street, between Fourth and Fifth avenues · Park Slope
Park Slope, Brooklyn
BBL 3009527507 · BIN 3414808
- Year built
- 2013
- Type
- Condominium
- Amenities
- Elevator, shared roof terrace, recreation room, bicycle and cellar storage, virtual doorman
- Landmark status
- Not an individual landmark; not in a historic district
- NYC Landmarks Preservation Commission and City Planning records, updated February 2026
- Doorman
- Requires confirmation
Every recorded sale at this building, 2007–2025
Price-per-square-foot over time, the line- and floor-premium curves, and every recorded sale.
- Median $/sf, 2025
- $1,049
- floor-adjusted, 1 sale
- Listing discount
- -1.8%
- Recorded sales
- 13
- On record
- 2007–2025
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 701 Union 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.
About the building
701 Union Street is a nine-residence elevator condominium developed on a site where construction had previously stalled. Jeffrey McKean took over the architectural work, and the completed DOB filing provides for five stories and nine apartments. The building's first condominium closings occurred in 2017, followed by the larger homes the next year.
The inventory includes compact one-bedroom apartments, lower duplexes and a three-bedroom penthouse arranged over two levels. Balconies connect the main-floor apartments with outdoor space; the penthouse has several private exterior areas, including a terrace above the street. The lower duplexes include a separate level for additional living or recreation space. Apartments have central air conditioning and in-home laundry, while a common roof terrace and recreation room serve the association.
Building staffing and amenities
- Doorman
- Requires confirmationSources differ. Confirm with building management.
- Virtual or video entry
- YesSource: The Roebling Team's building profile
- Elevator
- YesSource: NYC Department of Buildings elevator records
- Amenities noted
- Roof deck, bike storageSource: The Roebling Team's building profile
Staffing and amenities as our building profile and recent listing records describe them. A feature not listed is not confirmed absent. Outdoor space, parking and some facilities can belong to particular apartments or to a separate owner; confirm access for the specific apartment.
Local Law 97
This building is below the 25,000 sq ft threshold at which LL97 limits apply to a building on its own. It is still covered if it shares a tax lot or condominium board with buildings totaling over 50,000 sq ft; confirm on DOB’s covered-buildings list.
See full Local Law 97 analysis →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.
| Date | Unit | Apartment | Price | PPSF | vs. Ask |
|---|---|---|---|---|---|
| Apr 8, 2025 | 1A | 1.5 BA · 777 sf | $815,000 | $1,049/sf | -8.9% |
| Oct 31, 2023 | 2A | 1 BR · 1 BA · 628 sf | $845,000 | $1,346/sf | +6.3% |
| Jul 15, 2020 | 1A | 1.5 BA · 811 sf | $636,406 | $785/sf | -29.3% |
| Jun 20, 2018 | PH | 3 BR · 2.5 BA · 1,641 sf | $2,421,500 | $1,476/sf | +0.9% |
| Jun 20, 2018 | PENTHOUSE | 1,641 sf | $2,421,500 | $1,476/sf | — |
| Sep 29, 2017 | 3A | 1 BR · 1 BA · 628 sf | $804,417 | $1,281/sf | +1.8% |
| Aug 10, 2017 | 4B | 1 BR · 1 BA · 603 sf | $784,052 | $1,300/sf | +1.8% |
| Jul 17, 2017 | 2A | 1 BR · 1 BA · 628 sf | $794,235 | $1,265/sf | +1.8% |
Market read. Most recent trades (2025) cleared a median $1,049/sf (floor-adjusted) across 1 sale. 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 -1.8% over ask.
The retrade record
Lines that have traded more than once in the public record — the building’s appreciation arc, apartment by apartment.
Full closing history with price-per-square-foot over time, the complete retrade record, and every line that has traded.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-00952-7507; 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.
What would your apartment rent for?
Enter your apartment and I'll send you what it would rent for, from comparable closed leases at 701 Union Street and nearby.
Buying here? Condo closing costs with a mortgage typically run 3 to 6% 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
Separate the lower duplex's recreation area from sleeping rooms. The additional level below the entrance floor is a significant part of those homes' usable space. Its permitted use and floor designation should remain explicit in the floor plan and purchase description; its inclusion in total interior area isn't a legal bedroom; confirm the certificate of occupancy's room count.
Comparable buildings
- Timber House: A nearby small condominium with a later construction system and larger residential inventory.
- 267–273 1st Street: A similarly small condominium with a range of apartment configurations.
- Lumber Yard Condominium: A low-rise condominium from an earlier development cycle.
- The Heritage at Park Slope: A larger low-rise condominium for comparing shared building costs and inventory.
More Park Slope buildings
- 675 Sackett Street (Park Slope Terrace) — 2003 condominium
- 680 Carroll Street — 1930 co-op
- 695 Degraw Street — 1899 condominium
- 703 President Street — 1920 co-op
- 712 Eighth Avenue (The Alessandro) — co-op
- 714 Sackett Street — condominium
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.
Considering a move at 701 Union Street?
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646.939.7375 · c.cohen@compass.com