89 Union Avenue
89 Union Avenue, Brooklyn, NY 11206
Williamsburg, Brooklyn
BBL 3022417535 · BIN 3428815
- Year built
- 2023
- Type
- Condominium
- Landmark
- No
Own an apartment here? See what it would sell for.
A Private Pricing Opinion — what your apartment at 89 Union Avenue 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.
89 Union Avenue is a five-residence condominium on a wide, irregular lot in South Williamsburg. The lot has about 106 feet of frontage, and the building holds about 17,800 gross square feet across five floors, per PLUTO. That is roughly 3,500 gross square feet of building per residence, a large figure for a five-unit Brooklyn condominium. Unit-level square footage is not confirmed in this review; the offering plan's Schedule A will state it.
Every residence has left the sponsor. Four sold by recorded deed between December 2023 and June 2026. Residence 2 was transferred out of the sponsor without consideration by a deed dated December 21, 2023, per ACRIS. No unit remains in sponsor hands, so the building now trades as resales.
The $9.9 million offering averages $1.98 million per residence.
Architecture and residences
Union Corner LLC bought the lot for $2,450,000 by deed dated January 26, 2021, per ACRIS. The new-building application had been filed in November 2020, approved in June 2021 and fully permitted later that month, per Department of Buildings records. It describes a five-story, 59-foot residential building with five dwelling units and about 16,100 zoning square feet (20,187 square feet of construction floor area). The Department of Buildings signed off the job on September 12, 2023, and a condominium tax-lot subdivision creating lots 4201 through 4205 was approved in April 2023. The units are numbered 1 through 5 in city records.
Finishes, layouts and amenities are not documented in the public records reviewed. Read the plan's description of the property before relying on any listing description.
Offering and pricing
Per the offering plan filed with the New York State Attorney General (plan CD220191), the plan was submitted August 29, 2022 and accepted April 6, 2023, with Union Corner LLC as sponsor and five residential units. The database shows a current total offering price of $9,900,000 and no separate price on acceptance. It does not record an effective date or a count of units sold, although ACRIS shows all five units deeded out of the sponsor. The amendments were not reviewed for this page; the Attorney General's plan-detail page returned no data when checked in October 2026.
Recorded sales
ACRIS shows these sponsor deeds:
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Residence 2: transferred without consideration ($0), deed dated December 21, 2023, recorded March 2024
-
Residence 5: $1,995,770, deed dated December 27, 2023
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Residence 4: $1,832,850, deed dated March 4, 2024
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Residence 1: $2,200,000, deed dated April 18, 2024
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Residence 3: $1,832,850, deed dated June 30, 2026
Three of the four priced amounts sit about 1.825% above a round number ($1,960,000 and $1,800,000 twice), the pattern of a sponsor grossing up the buyer-paid transfer taxes into the deed price. That reading is our arithmetic; the contracts are not public. The four deeds total $7.86 million. Against PLUTO's gross building area, the full $9.9 million offering works out to about $556 per gross square foot, our arithmetic. Unit-level transaction history is maintained in The Roebling Research Library and shared with clients during diligence.
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 |
|---|---|---|---|---|
| Dec 27, 2023 | 5 | 3,161 sf | $1,995,770 | $631/sf |
Market read. $/sf is measured on the latest sales with reliable square footage (2023): a median $631/sf (recorded) across 1 sale. The building has traded as recently as 2026.
Sales sourced from NYC Department of Finance recorded transfers (BBL 3-02241-7535; 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.
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What to know if you’re buying
No sponsor inventory. All five units have been deeded out of the sponsor. Any purchase here is a resale from an individual owner.
Resales. Compare any ask with the four priced deeds above; the Residence 2 transfer carries no price and is not a comparable.
Size. The building's gross area per residence is unusually high. Confirm each home's interior square footage, outdoor space and storage in the plan.
Closing costs. In sponsor sales the buyer customarily pays the New York State transfer tax (0.4%) and the New York City real property transfer tax (1.425% above $500,000), plus the mansion tax of 1% between $1 million and $2 million and 1.25% between $2 million and $3 million.
Small-building governance. Five owners run the building. Read the budget, the reserve and the by-laws on repairs to the roof and façade.
Comparable buildings
- 119 Lorimer Street — 14-apartment 2005 condominium on the same block
- 144 Middleton Street — four-home 2005 condominium on the same block
- 476 Union Avenue — nine-residence Williamsburg condominium with garden and penthouse homes
- 402 Union Avenue — six-residence Williamsburg condominium completed in 2025, sponsor sales from $1.82 million
- 538 Union Avenue — thirteen-residence Union Avenue condominium with a roof deck and parking
More Williamsburg buildings
- 86–88 Middleton Street, 86–88 Middleton Street · Williamsburg — condominium
- 88 Withers Street (Element 88) — 2018 condominium
- 89 South 4th Street — 1994 condominium
- 90 North 5th Street — 2010 condominium
- 96 North 1st Street — 1950 condominium
- 98 Havemeyer Street (Williamsburgh Mews) — 2002 condominium
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Williamsburg.
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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646.939.7375 · c.cohen@compass.com