Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $2,300,000

· Closed September 30, 2025

509 6th Avenue
Closed For Sale Duplex

$2,300,000

$1,217 per sq ft

509 6th Avenue

Park Slope, Brooklyn

MLS® #RLS20017916

RLS at REBNY

Listing by Compass

3

Bedrooms

1.5

Baths

1,890

Sq. Ft.

1899

Year Built

Quick Summary

Bedrooms 3
Bathrooms 2 full, 1 half
Living Area 1,890 sq ft
Year Built 1899
Ownership None
Property Taxes $4,116/yr
Neighborhood Park Slope
Floor 1 of 2

Property Highlights

  • Outdoor Space: Patio
  • Fireplace: 1 fireplace
  • Character: Pre-war building (1899)

Property Details

Type Duplex
Ownership None
Total Rooms 7
Baths 1 Full, 1 Half
Floor 1 of 2
Pets Yes
Year Built 1899
Living Area 1,890 sq ft
Structure Type Duplex,Townhouse
Flooring Hardwood
Furnished Unfurnished
Basement Full
Parcel # 01030-0005
Block/Lot 01030/5

Listing History

Event Date Price Change
Listed Apr 22, 2025 $2,500,000 -
Currently May 7, 2026 $2,300,000 -8.0%

Description

Oh how sweet it is ... Location, Location Location Welcome to 509 6th Avenue , a 2 family Federal Brick Townhouse currently being used as single family ideally located on leafy and charming 6th Avenue.The property offers classic old world charm and an excellent location, within 1 block of Park Slope's major shopping boulevards. As you step inside the garden level, the 15 foot wide home features a spacious room that can be transformed into a family room or living room and has an internal walkway with built-in China closet and pantry that leads you to an eat-in kitchen. The eat in kitchen is in the rear of the garden level and needs updating. Your kitchen overlooks a spacious raised garden bed. It’s a perfect spot for morning coffee, dining al fresco, honing your grilling skills, or the backdrop for a private yoga mediations session. The backyard offers endless possibilities for outdoor living and with a northwestern exposure ensuring plenty of natural light. The house has approximately 2936 square feet of FAR* to build up or out! with unused FAR of 1,042, so there’s room to expand and customize to suite your needs.*Please consult an architect for confirmation on FAR.)The parlor floor is very bright and features two large and sun drenched rooms The southern and northern exposures and high ceilings ensure that the home is bathed in natural light throughout the day, creating a warm and inviting atmosphere in every room. The top floor features three well-appointed bedrooms including large L shaped sun drench bedroom with an albaster marble fireplace. In the center of the top floor, is a bright bathroom enhanced by a skylight and showcasing a classic black-and-white design with subway tiles, a spacious vanity, and a large claw footed tub. The kitchen and bathroom are functional but could certainly use updating. The home is located three block from Prospect Park, the F/G subway and Nitehawk Cinema. There are many restaurants and shops within a few blocks and within steps to Muse Cafe, Mariella, Crosta, Piccoli Trattoria, and Athena. CItibike station is located at the end of the block. Photos are virtually staged Call for a private showing.

Features & Amenities

Interior Features

Built In Features Crown Molding High Ceilings See Remarks Flooring: Hardwood Fireplace (1)

Exterior Features

Private Entrance Private Outdoor Space Over60 Sqft Patio

Appliances

Dryer Washer

Building Information

Building Data View Compliance & Permits
Total Units 2
Stories 2
Structure Duplex,Townhouse

Financial Details

RE Taxes $4,116/yr ($343/mo)
Original Price $2,500,000
Sale Price $2,300,000
Previous Price $2,500,000

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

115

Median Asking Price

$1.59M

Median $/Sqft

$1,407

Avg Days on Market

N/A

New This Week

20

Price Reduced

16%

Sold (30 Days)

28

Median Sale Price

$1.59M

Live data from RLS at REBNY • Updated 5/7/26, 6:48 PM EST

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Location

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509 6th Avenue, Park Slope, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1899
Year Built
127 years old
2
Floors
2
Residential Units
R6B
Zoning District
Two Family Dwellings

Tax & Assessment

Assessed Value: $141,480
Land Value: $24,360
Exemptions: $0

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

Lot Area: 1,468 SF
Building Area: 1,890 SF
Built FAR: 1.29
Allowed FAR: 2

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 common charges are $0 per month. Confirm the exact amount with the listing broker before making an offer.

The current listed annual property tax is $4,116, or roughly $343 per month. Verify the current assessment with your attorney before closing.

This property has 3 bedrooms and 1 full bathroom and 1 half bathroom.

The listed interior living area is 1,890 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1899, making it approximately 127 years old.

This listing is None

Pet policy requires confirmation with the listing broker.

At the current list price of $2,300,000 for 1,890 sq ft, the asking price per square foot is approximately $1,217. This figure is for reference only and may differ from appraised or assessed values.

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) 416-7433
MLS® ID: RLS20017916
First Listed: 4/22/2025
On Market: 4/22/2025
Price Changed: 9/30/2025
Closed: 9/30/2025
Contract Date: 1/18/2025

Listing Courtesy of Compass - Claudia P Caicedo

Listing Contact: (917) 435-5554

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 5/7/2026 at 10:48 PM UTC

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