Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433

SOLD FOR $1,600,000

· Closed November 25, 2025

645 W END Avenue #9C
Closed For Sale Co-op

$1,600,000

$1,067 per sq ft

645 W END Avenue #9C

Upper West Side, Manhattan

MLS® #RLS20004838

RLS at REBNY

Listing by Berkshire Hathaway HomeServices New York Properties

3

Bedrooms

3

Baths

1,500

Sq. Ft.

1906

Year Built

Quick Summary

Bedrooms 3
Bathrooms 3
Living Area 1,500 sq ft
Year Built 1906
Ownership Co-op
Maintenance $3,600/mo
Neighborhood Upper West Side
Floor 9 of 12

Property Highlights

  • Views: Other
  • Exposure: East,North facing
  • Character: Pre-war building (1906)

Property Details

Type Co-op
Ownership Stock Cooperative
Total Rooms 6
Baths 3 Full
Floor 9 of 12
View Other
Exposure East,North
Pets Yes
Year Built 1906
Living Area 1,500 sq ft
Structure Type HighRise
Basement Other
Block/Lot 01251/0062

Listing History

Event Date Price Change
Listed Feb 24, 2025 $1,900,000 -
Price Reduced Dec 3, 2025 $1,650,000 -13.2%
Currently Apr 26, 2026 $1,600,000 -3.0%

Description

This stunning Classic Six is located in the renowned pre-war co-op at 645 West End Avenue, a masterpiece by esteemed Italian architect Gaetan Ajello.

Apartment 9C features two spacious bedrooms, plus a staff room or home office, along with 3 bathrooms.

The formal dining room is warm and inviting, showcasing original wood-paneled walls and beamed ceilings. French doors with their original one side of mahagony and the other of oak lead into the living room, where oversized windows, elegant moldings, and high ceilings add to the charm.

Both bedrooms are generously sized, with the primary bedroom facing east over West End Avenue, allowing natural light to pour in. The en-suite bathroom features a standing shower. The second full bathroom is beautifully appointed with a deep soaking tub, a wood and marble vanity, a stained glass window and classic subway-tiled walls.

The large windowed kitchen has been thoughtfully preserved, featuring modern cabinetry, stainless steel appliances, a deep-soaking sink, ample storage, and a separate butler's pantry.

Just off the kitchen, the original maid's room with a full bath is tucked away from the other bedrooms, making it a perfect private space for a home office, guest room, or cozy den.

This inviting home is completed by hardwood floors, high ceilings, pre-war details, original moldings, and stained-glass windows. In-unit washers and dryers are permitted with board approval.

The impeccably maintained, full-service, pet-friendly building offers a 24-hour doorman, a live-in superintendent, newly updated common hallways, a rooftop gym with new equipment, a bike room, storage rooms, and a beautifully landscaped roof deck. 645 West End Avenue stands as one of the most distinguished residential buildings on West End Avenue, known for its turn-of-the-century craftsmanship and attention to detail. 5% flip tax on net profit.

Built in 1912 by renowned Italian architect Gaetan Ajello, this Turn Of The Century treasure holds a prominent and distinguished place on West End Avenue. Designed on a grand scale this prominent residence offers an abundance of pre-war details such as, an attended elaborate lobby with soaring ceilings and marble details. The apartments feature very high ceilings (10 to 12 feet), handsome oak paneled and beamed ceilings in the dining rooms, stained glass windows and decorative moldings throughout. Although the building appears massive in size, it is an intimate building with only 72 units. The building residents can enjoy a magnificent landscaped roof garden and gym/exercise room on the rooftop.

Features & Amenities

Interior Features

Building None

Exterior Features

None

Building Amenities

Elevators

Appliances

Washer Dryer Allowed

Building Information

Building Data View Compliance & Permits
Total Units 72
Stories 12
Structure HighRise

Financial Details

Maintenance $3,600/mo
Original Price $1,900,000
Sale Price $1,600,000
Previous Price $1,650,000

The Upper West Side (UWS) is celebrated for its cultural richness and architectural grandeur. Set between Central Park and Riverside Park, the neighborhood provides direct access to green space within the urban grid. Residents enjoy easy access to Lincoln Center, the American Museum of Natural History, and a popular culinary scene. The real estate landscape is famous for its historic brownstones and iconic 'white-glove' apartment buildings along Central Park West and Riverside Drive.

Upper West Side Live Market Data

View Neighborhood

Active Listings

585

Median Asking Price

$1.70M

Median $/Sqft

$1,456

Avg Days on Market

N/A

New This Week

23

Price Reduced

28%

Sold (30 Days)

69

Median Sale Price

$1.85M

Live data from RLS at REBNY • Updated 4/25/26, 11:15 PM EST

Similar Listings in Upper West Side

View All

Location

Loading map...

645 W END Avenue #9C, Upper West Side, New York County

Floor Plans

Floor Plan

Building Information

Official NYC property records for this building

1913
Year Built
113 years old
12
Floors
73
Residential Units
R10A
Zoning District
Elevator Apartments Historic District: Riverside-West End Historic District

Tax & Assessment

Assessed Value: $10,063,800
Land Value: $1,997,100
Exemptions: $56,654

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

Lot Area: 13,410 SF
Building Area: 136,062 SF
Built FAR: 10.15
Allowed FAR: 10

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 $3,600 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 1,500 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1906, making it approximately 120 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: Pets Allowed,Building Pets Allowed Comments:Pets Allowed. Contact the listing broker for weight limits or breed restrictions.

At the current list price of $1,600,000 for 1,500 sq ft, the asking price per square foot is approximately $1,067. 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: RLS20004838
First Listed: 2/24/2025
On Market: 2/24/2025
Price Changed: 12/3/2025
Closed: 11/25/2025
Contract Date: 2/24/2025

Listing Courtesy of Berkshire Hathaway HomeServices New York Properties - Matthew George

Listing Contact: (646) 677-0031

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 4/26/2026 at 3:15 AM UTC

Buying a Co-op? Start Here

Co-op vs. Condo: Which Is Right for You?

Ownership structure, board approval, financing: the full comparison.

Read article

How to Ace Your Co-op Board Interview

What boards look for, common questions, and how to prepare.

Read article

NYC Flip Tax Guide for Sellers

What co-op flip taxes are, how they're calculated, and who pays.

Read article

HDFC Co-ops: Complete Guide

Income limits, resale caps, and how to qualify for affordable co-ops.

Read article

Interested in this property?

Get a response within 2 hours

Your info is secure and never shared.

View Active Listings Call Milton