SOLD FOR $3,000,000
· Closed March 5, 2026
$3,000,000
823 UNION Street
MLS® #RLS20057426
Listing by Brown Harris Stevens Brooklyn LLC
6
Bedrooms
3
Baths
N/A
Sq. Ft.
1901
Year Built
Quick Summary
Property Highlights
- Views: Other
- Fireplace: 1 fireplace
- Style: WalkUp architecture
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Nov 18, 2025 | $3,000,000 | - |
| Price Reduced | May 19, 2026 | $2,995,000 | -0.2% |
Description
IN CONTRACT
Two family, 3 story + cellar brownstone on 20 x 90 foot lot. Much original detail intact; plaster moldings, wood doors and window shutters. Garden level is a two bedroom, one bath unit with kitchen open to living room, and access to rear garden thru larger bedroom. Upper duplex has large living room with bay window, separate formal dining room and separate kitchen, powder room in hallway. Top floor has four bedrooms and two full baths; one ensuite to front bedroom. Metal deck off dining room on parlor floor. Rear garden. Large cellar contains gas boiler, water heater and meters.
Features & Amenities
Interior Features
Exterior Features
Building Amenities
Building Information
Financial Details
About Park Slope
View All Park Slope ListingsPark Slope is a well-known Brooklyn neighborhood, recognized for its tree-lined streets and preserved brownstones. Bordering the western edge of Prospect Park, the neighborhood offers convenient access to green space. The real estate market features a mix of historic townhouses, cooperatives, and modern condominiums, within walking distance of the park.
Park Slope Live Market Data
View NeighborhoodActive Listings
123
Median Asking Price
$1.85M
Median $/Sqft
$1,440
Avg Days on Market
N/A
New This Week
18
Price Reduced
20%
Sold (30 Days)
13
Median Sale Price
$2.26M
Live data from RLS at REBNY • Updated 5/31/26, 10:42 PM EST
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Location
823 UNION Street, Park Slope, Kings County
Floor Plans
Building Information
Official NYC property records for this building
Tax & Assessment
Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.
Source: NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning (data.cityofnewyork.us)
Want help estimating ownership costs or understanding building compliance? Let's discuss
Listing Data
RLS® at REBNY (Real Estate Board of New York) via Trestle API. Updated in real-time.
Building Data
NYC PLUTO (Primary Land Use Tax Lot Output), NYC Department of City Planning. Updated quarterly.
Market Data
RLS® at REBNY (Real Estate Board of New York). Live data updated in real-time.
Map & Location
OpenStreetMap contributors via Leaflet. Geocoding via Nominatim.
All data is provided for informational purposes only and should be independently verified. See our Data Sources Policy for more information.
Frequently Asked Questions
Common questions about this property
The current listed annual property tax is $8,520, or roughly $710 per month. Verify the current assessment with your attorney before closing.
This property has 6 bedrooms and 3 full bathrooms.
According to MLS records, the building was constructed in 1901, making it approximately 125 years old.
This listing is None
Pets are permitted at this property. Contact the listing broker for weight limits or breed restrictions.
To schedule a private showing, contact Milton Coste at (917) 416-7433 or [email protected]. Per REBNY guidelines effective 2025, a Buyer Representation Agreement is required before a buyer's broker can show you properties. You may attend open houses independently without one.
Have a question not answered here?
(917) 416-7433Listing Courtesy of Brown Harris Stevens Brooklyn LLC - Margaret Anne L Newville J
Listing Contact: (347) 262-7243
Listing information for certain New York City properties provided courtesy of the Real Estate Board of New York's Residential Listing Service (the "RLS"). The information contained in this listing has not been verified by the RLS and should be verified by the consumer. The listing information provided here is for the consumer's personal, non-commercial use. Retransmission, redistribution or copying of this listing information is strictly prohibited except in connection with a consumer's consideration of the purchase and/or sale of an individual property. This listing information is not verified for authenticity or accuracy and is not guaranteed and may not reflect all real estate activity in the market. ©2026 The Real Estate Board of New York, Inc., all rights reserved. This advertisement does not suggest that the broker has a listing in this property or properties or that any property is currently available.
Broker Commission Disclosure: Broker commissions are not set by law and are fully negotiable.
Buyer Notice: Planning to work with a buyer's broker? A Buyer Representation Agreement is required before your broker can show you properties, per REBNY/UCBA guidelines (effective 2025). You may attend open houses independently without one.
RLS Data display by Keller Williams NYC. Data last updated on 6/1/2026 at 2:42 AM UTC