For Sale · Listing by Brown Harris Stevens Brooklyn LLC
323 PROSPECT Avenue
Park Slope, Brooklyn
$2,350,000
$2,350,000
323 PROSPECT Avenue
MLS® #RLS20117153
Listing by Brown Harris Stevens Brooklyn LLC
Open Houses Scheduled
Saturday, September 26 • 1:00 PM – 3:00 PM
Sunday, September 27 • 12:00 PM – 2:00 PM
REBNY 2025: signed Buyer Representation Agreement required before any showing.
- 4
- Bedrooms
- 3
- Baths
- N/A
- Sq. Ft.
- 1901
- Year Built
Quick Summary
Property Highlights
- Views: Other
- Outdoor Space: Terrace
- Fireplace: 1 fireplace
Property Details
Listing History
| Event | Date | Price | Change |
|---|---|---|---|
| Listed | Sep 24, 2026 | $2,350,000 | - |
| Currently | Sep 24, 2026 | $2,350,000 | - |
Description
323 Prospect Avenue Built in 1901 Two-Family Row House Lot: 18.42ft x 80ft Building: 18.42 x 30ft (plus extension on garden level) Set among South Slope's characteristic rowhouses, 323 Prospect Avenue is a lovely two-family house that allows incredible flexibility of use. Currently configured as a lower 2-bedroom, 2-bathroom duplex with basement and a private backyard and an upper 2-bedroom, 1-bathroom duplex, this charming home could easily be converted into a spacious single-family residence. The lower duplex was extensively renovated by the current owners, creating a warm and inviting home that blends thoughtful updates with original character. The kitchen features custom cabinetry and beautiful Italian Pietra Cardoso stone island and countertops. A custom-built bookshelf in the living room cleverly converts into a functional workspace. Original brick walls and fireplaces, together with beautiful cherry floors, add warmth and texture throughout. The rear of the property houses the sun-filled primary bedroom with en-suite bath, overlooking the peaceful backyard which has been lovingly cultivated as an organic garden for many years. Filled with mature plantings and flowers such as a native serviceberry, lilacs, roses and daffodils, and blessed with abundant sunlight and privacy, the garden is a true sanctuary in the city. The upper duplex retains the charm and character of the original house, with exposed brick walls and original tin ceilings. With two bedrooms, a full bathroom, and flexible layout spread across two floors, the apartment offers a wonderful sense of separation and privacy. Together, the two apartments create a flexible home that can accommodate a variety of living arrangements and evolve over time. Ideally located close to Prospect Park, the R train at Prospect Ave and the F/G trains at 7th Ave station, 323 Prospect Avenue offers the best of Brooklyn living within the vibrant neighborhoods of South Slope and Greenwood Heights. This special home is surrounded by the restaurants, cafés, shops, and everyday conveniences that make Park Slope so desirable, such as Giuseppina's, Folk, Buttermilk Bar and many more.
Features & Amenities
Interior Features
Exterior Features
Building Amenities
Appliances
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
99
Median Asking Price
$1.90M
Median $/Sqft
$1,356
Avg Days on Market
N/A
New This Week
19
Price Reduced
11%
Sold (30 Days)
34
Median Sale Price
$1.70M
Live data from RLS at REBNY • Updated 9/24/26, 12:00 PM EST
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Location
323 PROSPECT Avenue, 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 $8,364, or roughly $697 per month. Verify the current assessment with your attorney before closing.
This property has 4 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 Milton Coste 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 - Cecilia Cina
Listing Contact: (917) 963-7186
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 9/24/2026 at 4:00 PM UTC
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Quick Facts
Monthly Costs Estimate
$470,000
Source: Freddie Mac PMMS
Est. Monthly Payment
$0
Estimates only. Consult a lender for exact figures.
Mansion tax applies at this price point
New York State charges the buyer a mansion tax on residential purchases at $1,000,000 or more. At this asking price the tier is $2M to $2,999,999 at 1.25%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.
Estimated mansion tax at asking
$29,375
Estimate based on the asking price. Confirm your own obligation with your real estate attorney.
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