361 Union Street
361 Union Street, Brooklyn, NY 11231
Carroll Gardens, Brooklyn
BBL 3004290074 · BIN 3007118
- Year built
- 1899
- Type
- Condominium
- Landmark
- No
361 Union Street is an 1899 house on a 20-by-90-foot lot in Carroll Gardens, recorded in PLUTO as a three-family building. The sponsor is converting it into two triplex condominiums: a garden home with the lower floors and yard, and a penthouse with the top floors and a roof terrace.
Two-unit townhouse condominiums let buyers own a large share of a brownstone without buying the whole house. At $4.5 million and $4.7 million, these two homes price above many full single-family houses on nearby blocks. The comparison buyers will make is a condominium triplex against a whole townhouse.
Architecture and residences
The Department of Buildings carries an alteration job that changes the certificate of occupancy to two dwelling units, filed in February 2025 with Paul Christakos Architecture as applicant, along with related filings through 2026. Listing records describe:
- Garden triplex: four bedrooms, four baths, about 2,501 square feet, with a lower-level recreation room over 30 feet long
- Penthouse triplex: five bedrooms, three and a half baths, about 2,096 square feet, with a roof terrace
Offering and pricing
Per the New York State Attorney General's database, the sponsor, 361 Union Realty LLC, submitted plan CD250372 on November 4, 2025, as a rehabilitation condominium with two residential units. The record shows no acceptance date, no amendments and no offering price as of October 2026.
Published asks:
- Garden triplex: $4,700,000, about $1,879 per square foot; projected common charges of about $1,528 and real estate taxes of about $990 a month
- Penthouse triplex: $4,500,000, about $2,147 per square foot; projected common charges of about $1,283 and taxes of about $831 a month
The common charges are high for a two-unit house. Ask what the budget covers: insurance, a reserve, the roof, the shared stair and any management fee.
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.
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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.
What to know if you’re buying
The plan is not yet accepted. Until the Attorney General accepts the plan, the sponsor cannot sign purchase contracts or take deposits. It can take only non-binding expressions of interest. Confirm acceptance and read the accepted plan before committing.
A two-unit condominium. Two owners share every building decision. Read the by-laws on deadlock, repairs, insurance and use of the yard and roof, and confirm which areas are limited common elements.
Closing costs. In sponsor sales the buyer customarily pays the New York State transfer tax (0.65% at $3 million or more) and the New York City real property transfer tax (1.425%), plus the mansion tax, 1.5% between $3 million and $5 million in New York City. Use the calculators below to run your price.
Tax class. Small condominiums of three units or fewer may be assessed in Tax Class 1. Ask the sponsor's counsel which class the plan's tax projection assumes.
Construction scope. Ask what was replaced in the 1899 structure, including the roof, façade, windows and mechanical systems, and what warranties the sponsor gives.
Comparable buildings
If you're considering 361 Union Street, also look at these Carroll Gardens condominiums:
- 351 Union Street — two-residence condominium created by a full townhouse renovation on the same block
- 364 Union Street — five-residence brownstone condominium across the street, converted by East River Partners
- 321 Union Street — seven-residence conversion with garden duplexes and upper terraces
- 370 Union Street — sixteen-residence prewar condominium conversion
- Sackett Union (291 Union Street) — new-construction condominium with townhouses and parking
More Carroll Gardens buildings
- 351 Union Street — 1920 condominium
- 358 Court Street — 1851 condominium
- 361 Clinton Street — 1987 condominium
- 364 Union Street
- 370 Union Street, 370–372 Union Street · Carroll Gardens — 1910 condominium
- 391 Clinton Street — 1909 co-op
The neighborhood
For the full neighborhood — its buildings, character, and market — read The Roebling Team Guide to Carroll Gardens.
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 361 Union Street?
Request a private building brief with the relevant comparable sales, current and off-market availability, and an apartment-specific view of value.
646.939.7375 · c.cohen@compass.com