Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
443 12TH Street #1B
Interested in this property?
Active For Sale Co-op

$2,150,000

$1,123 per sq ft

443 12TH Street #1B

Park Slope, Brooklyn

Ansonia Warehouse

MLS® #RLS20086151

RLS at REBNY

Listing by Corcoran Group

3

Bedrooms

2

Baths

1,915

Sq. Ft.

1960

Year Built

Quick Summary

Bedrooms 3
Bathrooms 2
Living Area 1,915 sq ft
Year Built 1960
Ownership Co-op
Maintenance $1,753/mo
Neighborhood Park Slope
Floor 1 of 5

Property Highlights

  • Views: Other
  • Exposure: South facing

Property Details

Type Co-op
Ownership Stock Cooperative
Total Rooms 7
Baths 2 Full
Floor 1 of 5
View Other
Exposure South
Pets Yes
Year Built 1960
Living Area 1,915 sq ft
Structure Type HighRise
Basement Other
Parcel # 01096-0050-00443-000-000001B
Block/Lot 01096/0050

Listing History

Event Date Price Change
Listed Apr 22, 2026 $2,150,000 -
Currently Apr 23, 2026 $2,150,000 -

Description

Loft 1B The Ansonia Clock Factory 443 12th Street

Set within the historic Ansonia Clock Factory,a distinguished early 20th-century Park Slope warehouse thoughtfully converted into cooperative residences, Loft 1B is a striking street-level duplex, meticulously redesigned in 2014 by architect Philippe Baumann. The renovation masterfully balances the building's industrial heritage with the clean, contemporary clarity for which Baumann Architecture is known.

Spanning approximately 1,915 square feet across two expansive levels, the residence is defined by its remarkable volume and structural character. A flood of natural light, soaring near triple-height ceilings, exposed brick, and original beam construction create a dramatic interplay between open living areas andA thoughtfully articulated private spaces.

Baumann's redesign emphasizes material continuity throughout, with hardwood flooring, steel and wood detailing, and extensive custom storage enhancing both functionality and aesthetic cohesion. Two distinct mezzanine levels further elevate the sense of verticality while offering flexibility for a variety of uses, whether as sleeping quarters, creative studios, or workspaces.

The upper level showcases preserved original structural elements, framing a generous eat-in kitchen and dining area unified within one expansive space, stylishly renovated with granite countertops and custom cabinetry, and anchored by soaring columns that lend a striking architectural presence.

In a chorus of elevated "floating" interventions, two mezzanine chambers and a full bathroom overlook the main living space. A distinctive system of accordion panels allows for adaptable privacy, elegantly modulating light and sound. Integrated LED lighting throughout enhances both ambiance and functionality.

A sculptural steel staircase serves as both centerpiece and connector, linking the upper volumes to a light-filled lower level designed for everyday living. This level offers generous space for lounging, working, and quiet retreat, all beneath impressive ceiling heights (24 feet height) and an abundance of natural light.

The primary suite completes the lower level, with integrated large closets, and featuring a glass-tiled en-suite shower room and a full-sized laundry room, set against modern concrete floors that echo the loft's industrial roots.

Accessible via elevator, the building's well-maintained communal rooftop offers sweeping views of Manhattan, including a direct sightline to the Statue of Liberty. It is an ideal setting for al fresco dining, sunset gatherings, and Fourth of July fireworks.

Located just minutes from Prospect Park, 443 12th Street retains the authentic character of its industrial past, with oversized windows, substantial proportions, and a true loft sensibility. Residents enjoy a professionally managed, pet-friendly cooperative with elevator access and a beautifully maintained shared rooftop, an exceptional extension of the home.

Features & Amenities

Interior Features

High Ceilings Walk In Closets Building None

Exterior Features

Private Outdoor Space Under60 Sqft

Building Amenities

Elevators

Appliances

Dishwasher

Building Information

Building Ansonia Warehouse
Total Units 36
Stories 5
Structure HighRise

Financial Details

Maintenance $1,753/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

110

Median Asking Price

$1.70M

Median $/Sqft

$1,376

Avg Days on Market

N/A

New This Week

8

Price Reduced

17%

Sold (30 Days)

22

Median Sale Price

$1.67M

Live data from RLS at REBNY • Updated 4/22/26, 9:16 PM EST

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Location

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443 12TH Street #1B, Park Slope, Kings County

Floor Plans

Floor Plan

Building Information

Official NYC property records for this building

1909
Year Built
117 years old
5
Floors
36
Residential Units
R6B
Zoning District
Elevator Apartments Historic District: Park Slope Historic District Extension

Tax & Assessment

Assessed Value: $2,515,500
Land Value: $198,450
Exemptions: $25,190

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

Lot Area: 8,500 SF
Building Area: 42,500 SF
Built FAR: 5
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 monthly maintenance are $1,753 per month. Confirm the exact amount with the listing broker before making an offer.

This property has 3 bedrooms and 2 full bathrooms.

The listed interior living area is 1,915 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1960, making it approximately 66 years old.

This listing is a co-op (stock cooperative). Buyers purchase shares in a corporation rather than real property, and the board must approve all sales.

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

At the current list price of $2,150,000 for 1,915 sq ft, the asking price per square foot is approximately $1,123. 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: RLS20086151
First Listed: 4/22/2026
On Market: 4/22/2026
Price Changed: 4/22/2026
Contract Date: 4/22/2026

Listing Courtesy of Corcoran Group - Jessica L Buchman

Listing Contact: (917) 579-8641

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 4/23/2026 at 1:16 AM UTC

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