By Caryl Berenato — Licensed Associate Real Estate Broker, Compass | REALM Global Member | Certified Senior Advisor
645 West End Avenue, Unit 11D is a three-bedroom, three-bath prewar cooperative on the Upper West Side, offered at $2,500,000. It's a Classic Six in a building designed in 1912 by Gaetan Ajello, and it has been meticulously restored — the original tiger oak, beamed ceilings, and stained glass preserved, the mechanical systems fully modernized behind them. In my four decades on these blocks I've learned that homes like this are scarce: real prewar architecture, intact and cared for, on a premier residential corridor between Riverside and Central Parks. Here's what the home is, who it suits, and what to know before you offer on a co-op like it.
What Is 645 West End Avenue, Unit 11D?
It's a Classic Six — the prewar layout of three bedrooms, a separate living room and formal dining room, a windowed kitchen, and three bathrooms (two full, one half), totaling six rooms. The residence faces south and east, so it holds light through the day, and it carries a monthly maintenance of $3,902. As a cooperative, the building requires a minimum of 30% down. The quick facts:
Detail | 645 West End Avenue, Unit 11D |
|---|---|
Price | $2,500,000 |
Property type | Cooperative (co-op) |
Bedrooms / bathrooms | 3 bed / 3 bath (2 full, 1 half) |
Layout | Classic Six (6 rooms) |
Maintenance | $3,902 / month |
Minimum down payment | 30% |
Exposures | South & east |
Building / architect | Designed 1912 by Gaetan Ajello |
Neighborhood | Upper West Side (between Riverside & Central Parks) |
You can see the full photo set and floor plan on the listing page for 645 West End Avenue, 11D.
The Building and the Block
645 West End Avenue was designed in 1912 by Gaetan Ajello, an architect whose prewar apartment houses helped define the Upper West Side's residential character. Residents arrive through a stately double-height lobby. The building is staffed by a full-time doorman and offers a landscaped roof terrace with open river views at sunset, a private fitness center, a bike room, and private storage by waitlist.
West End Avenue is the quieter of the West Side's grand residential corridors — one block in from Riverside Park and the Hudson, and a short walk from Central Park to the east. It's prewar in its bones, with the proportions and light that new construction simply can't reproduce, and it has long been one of the smartest value positions on the West Side for a large prewar layout.
What Makes This Restoration Different
What sets 11D apart is the care taken with its original material. The tiger oak wainscoting, beamed ceilings, crown moldings, and hardwood inlays have all been revived, while the electrical and plumbing systems behind them have been fully modernized — the rare combination of period integrity and current infrastructure.
The kitchen is built around original glass-front oak cabinetry with generous storage, honed soapstone counters, and original tile. Each of the bathrooms keeps an original stained-glass window, and there are six cedar-lined closets throughout, including a walk-in off the primary. A decorative fireplace anchors the living room. The home is largely finished, with a few decorative details left for a buyer to make their own.
Who This Home Suits
This is a home for a buyer who wants real prewar architecture and craftsmanship rather than a new-development finish — someone drawn to a Classic Six layout, southern and eastern light, and a serviced, amenity-rich prewar building on a calm West End Avenue block. The third bedroom and half bath give genuine flexibility for a home office or a guest suite. Because it's a cooperative with a 30% minimum down, it fits a buyer who is comfortable with co-op ownership and a board process — which I walk every client through well before we write an offer.
What to Know Before You Offer on a Prewar Co-op
A co-op purchase is as much an application to a building as it is an offer on an apartment. Two things to understand going in:
Carrying costs and financing. The maintenance here is $3,902 per month, and the building requires at least 30% down. How you structure the rest — cash versus financing — affects both your monthly cost and how the board reads your application. I break that decision down in cash vs. financing at the high end.
The board. Co-op boards review your finances, your purchase structure, and your package in detail before they approve a sale. Preparation is everything. I lay out how these approvals actually work in my guide to NYC co-op board approval.
My job is to position your offer and your board package so the apartment — the easy part — doesn't get lost in the application.
Frequently Asked Questions
How much is 645 West End Avenue, Unit 11D?
It is offered at $2,500,000. As a cooperative, it also carries a monthly maintenance of $3,902 and requires a minimum of 30% down.
What are the carrying costs?
The monthly maintenance is $3,902. In a co-op, maintenance covers the building's underlying mortgage, property taxes, staff, and operations — there is no separate property-tax bill the way there is with a condo.
Is 645 West End Avenue a co-op or a condo?
It's a cooperative. That means you're buying shares in the building corporation with a proprietary lease to your apartment, the building sets the financing minimum (30% here), and a board reviews and approves the purchase.
Who designed 645 West End Avenue?
The building was designed in 1912 by Gaetan Ajello, an architect known for the prewar apartment houses that shaped much of the Upper West Side's residential streetscape.
What is a "Classic Six," and who is this layout right for?
A Classic Six is a prewar layout of six rooms — typically a living room, a formal dining room, a kitchen, two bedrooms, and a maid's or third room — here configured as three bedrooms. It suits a buyer who wants defined, separate rooms and prewar proportions rather than an open-plan floor.
How much can I finance on this apartment?
The building requires at least 30% down, so financing is capped accordingly. Whether you put down the minimum or more is a strategic decision — I cover the trade-offs in cash vs. financing at the high end.
How do I see the apartment?
Reach out and I'll arrange a private showing. You can review the full photo set and floor plan on the listing page first.
To see 645 West End Avenue, 11D in person, or to talk through a confidential Upper West Side search, contact me.