Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
343 6TH Avenue #4
Interested in this property?
Active For Sale Apartment

$5,250,000

$2,425 per sq ft

343 6TH Avenue #4

Park Slope, Brooklyn

MLS® #RLS20096977

RLS at REBNY

Listing by Corcoran Group

3

Bedrooms

3

Baths

2,165

Sq. Ft.

N/A

Year Built

Quick Summary

Bedrooms 3
Bathrooms 3
Living Area 2,165 sq ft
Year Built N/A
Ownership None
HOA/Common Charges $1,067/mo
Neighborhood Park Slope
Floor 4 of 4

Property Highlights

  • Views: City, Panoramic
  • Exposure: East,South,West facing
  • Fireplace: 1 fireplace

Property Details

Type Apartment
Ownership None
Total Rooms 10
Baths 3 Full
Floor 4 of 4
View City, Panoramic
Exposure East,South,West
Pets Yes
Living Area 2,165 sq ft
Architectural Style WalkUp
Basement Other
Parcel # 00983-1505
Block/Lot 00983/0001

Listing History

Event Date Price Change
Listed Jun 10, 2026 $5,250,000 -
Currently Jun 11, 2026 $5,250,000 -

Description

Rarely does a home combine the scale, privacy, and outdoor living of a brownstone with the convenience of elevator condominium living. Occupying the entire top floor of a boutique condominium building, this elevator accessible three-bedroom-plus-den, three-bathroom penthouse spans 2,165 square feet, and is complemented by an extraordinary private roof terrace crafted for seamless indoor-outdoor living. Wrapped in twenty oversized windows on four exposures, this residence is flooded with sunlight from sunrise to sunset, with sweeping sky views and exceptional privacy throughout. A keyed elevator opens directly into the home, revealing the thoughtfully designed living space. White-oak herringbone floors, soaring ceilings, walnut millwork, and an open floor plan create an atmosphere that is elegant, comfortable, and welcoming. The heart of the home is a dramatic 28 foot-wide great room where expansive living and dining areas are framed by treetop views and open sky. A gas fireplace, built-in shelving, and abundant natural light create a setting equally suited to everyday family life and large-scale entertaining. Throughout the seasons, the views transform from lush summer greenery to golden autumn leaves; to snow-covered branches in winter; and to flowering pear trees in spring. French doors open to a den lined with walnut shelving and built-in storage. Currently configured as a home office, the space easily functions as a library, nursery, playroom or fourth bedroom. The award-winning kitchen pairs beauty with functionality, featuring solid wood cabinetry by purekitchen-imperia, Carrara marble backsplash wall, a generous waterfall island, Wolf cooking appliances, Sub-Zero refrigeration, Miele dishwasher, and ample workspace for cooking, gathering, and entertaining. Privately situated at the opposite end of the residence, the primary suite enjoys triple exposures, abundant closet space, and open views extending across neighboring brownstone gardens. The spa-inspired bath features radiant heated floors, a soaking tub, walk-in shower with teak flooring, detailed vanity cabinetry, and Waterworks fixtures. Two additional bedrooms offer excellent closet space and skyline views - including One World Trade Center - and are served by two beautifully appointed full bathrooms. Additional features include a dedicated laundry room with ample storage, zoned central HVAC, integrated Sonos audio, on-demand hot water, and top-of-the-line double-paned windows providing maximum insulation and noise reduction. The crown jewel of the residence is an approximately 800-square-foot private rooftop terrace and garden with sweeping views extending to the Manhattan skyline. The rooftop functions as an outdoor wing of the home. Accessible by both elevator and stairs, this remarkable space has been designed for living, dining, cooking, entertaining, and gardening. A wisteria-covered pergola anchors the outdoor living area, while mature landscaping, flowering trees, roses, hydrangeas, and seasonal gardens create a level of tranquility rarely found in New York City. The fully equipped outdoor kitchen features ipe-clad cabinetry, a premium DCS grill with rotisserie, power side burner, refrigerator, freezer, hot/cold running water, Dekton countertops, and generous preparation space. Whether hosting sunset dinners against the Manhattan skyline, tending a morning garden, or enjoying a quiet evening beneath the stars, the rooftop serves as a seamless extension of the home below. 343 Sixth Avenue is a modern boutique elevator condominium built from the ground up by Ramon Maizlin and Sugar Hill Capital Partners, the team behind the acclaimed One Prospect Park West, distinguished by exceptionally low carrying costs and a valuable J-51 tax abatement. Located on one of Park Slope's quintessential tree-lined blocks and zoned for PS 321, the building is moments from Prospect Park, J.J. Byrne Playground, the Old Stone House, the Prospect Park YMCA, and the neighborhood's beloved cafés, restaurants, and shops.

Features & Amenities

Interior Features

High Ceilings Walk In Closets Building None Washer Hookup In Unit Fireplace (1)

Exterior Features

Private Outdoor Space Over60 Sqft

Building Amenities

Elevators

Appliances

Dishwasher Washer Dryer Allowed

Building Information

Building Data View Compliance & Permits
Total Units 5
Stories 4
Style WalkUp

Financial Details

Common Charges $1,067/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

129

Median Asking Price

$1.85M

Median $/Sqft

$1,362

Avg Days on Market

N/A

New This Week

13

Price Reduced

21%

Sold (30 Days)

21

Median Sale Price

$2.23M

Live data from RLS at REBNY • Updated 6/10/26, 10:29 PM EST

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Location

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343 6TH Avenue #4, Park Slope, Kings County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1920
Year Built
106 years old
4
Floors
5
Residential Units
R6B
Zoning District
Condominiums

Tax & Assessment

Assessed Value: $707,400
Land Value: $26,551
Exemptions: $109,540

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

Lot Area: 2,708 SF
Building Area: 10,233 SF
Built FAR: 3.78
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 $1,067 per month. Confirm the exact amount with the listing broker before making an offer.

This property has 3 bedrooms and 3 full bathrooms.

The listed interior living area is 2,165 square feet. Verify dimensions independently during due diligence.

This listing is None

Pets are permitted at this property. Contact the listing broker for weight limits or breed restrictions.

At the current list price of $5,250,000 for 2,165 sq ft, the asking price per square foot is approximately $2,425. 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 mcoste@kwnyc.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: RLS20096977
First Listed: 6/10/2026
On Market: 6/10/2026
Price Changed: 6/10/2026
Contract Date: 6/10/2026

Listing Courtesy of Corcoran Group - Nathalie Roy

Listing Contact: (718) 501-8763

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 6/11/2026 at 2:29 AM UTC

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