Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
323 PROSPECT Avenue

For Sale · Listing by Brown Harris Stevens Brooklyn LLC

323 PROSPECT Avenue

Park Slope, Brooklyn

$2,350,000

Interested in this property?
Active For Sale • Multi Family

$2,350,000

323 PROSPECT Avenue

Park Slope, Brooklyn

MLS® #RLS20117153

RLS at REBNY

Listing by Brown Harris Stevens Brooklyn LLC

4
Bedrooms
3
Baths
N/A
Sq. Ft.
1901
Year Built

Quick Summary

Bedrooms 4
Bathrooms 3
Lot Size 1,473.6 sq ft
Year Built 1901
Ownership None
Property Taxes $8,364/yr
Neighborhood Park Slope
Floor 1 of 2

Property Highlights

  • Views: Other
  • Outdoor Space: Terrace
  • Fireplace: 1 fireplace

Property Details

Type Multi Family
Ownership None
Total Rooms 6
Baths 3 Full
Floor 1 of 2
View Other
Cooling Other
Pets Yes
Year Built 1901
Architectural Style WalkUp
Basement Other
Lot Size 1,473.6 sq ft
Parcel # 01054-0046
Block/Lot 01054/0046

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

High Ceilings Smoke Free Storage Building Other Washer Hookup In Unit Fireplace (1)

Exterior Features

Garden Private Outdoor Space Over60 Sqft Terrace

Building Amenities

Green Building

Appliances

Washer Dryer Allowed

Building Information

Building Data View Compliance & Permits
Total Units 2
Stories 2
Style WalkUp

Financial Details

RE Taxes $8,364/yr ($697/mo)

Park 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 Neighborhood

Active Listings

99

Median Asking Price

$1.90M

Median $/Sqft

$1,356

Avg Days on Market

N/A

New This Week

19

Price Reduced

12%

Sold (30 Days)

35

Median Sale Price

$1.70M

Live data from RLS at REBNY • Updated 9/24/26, 6:14 PM EST

Location

Loading map...

323 PROSPECT Avenue, Park Slope, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1901
Year Built
125 years old
2
Floors
2
Residential Units
R5B
Zoning District
Two Family Dwellings

Tax & Assessment

Assessed Value: $194,160
Land Value: $18,600
Exemptions: $0

Note: Individual unit taxes may differ. Verify current tax bills with NYC DOF.

Lot Area: 1,473 SF
Building Area: 2,078 SF
Built FAR: 1.41
Allowed FAR: 1.5

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

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 milton@miltoncoste.com. 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) 416-7433
MLS® ID: RLS20117153
First Listed: 9/24/2026
On Market: 9/24/2026
Price Changed: 9/24/2026
Contract Date: 9/24/2026

Listing 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 at REBNY

RLS Data display by Keller Williams NYC. Data last updated on 9/24/2026 at 10:14 PM UTC

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Park Slope Market Update

35 sales last 30 days · $1.90M median · 2.8 months supply

Read Full Report

New listings in this neighborhood

Quick Facts

Status Active Type Multi Family Neighborhood Park Slope Borough Brooklyn
County Kings
Floor 1 of 2
Year Built 1901
First Listed 9/24/2026
Style WalkUp
Annual Tax $8,364

Monthly Costs Estimate

Down Payment 20%

$470,000

Interest Rate Loading...

Source: Freddie Mac PMMS

Loan Term 30 years

Est. Monthly Payment

$0

Principal & Interest $0
PMI (under 20% down) $0
Est. Taxes $697
Total Monthly $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

Run the numbers on a different offer price

Estimate based on the asking price. Confirm your own obligation with your real estate attorney.

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