Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
170 E 77th Street #6A

For Sale · Listing by Compass

170 E 77th Street #6A

Lenox Hill, Manhattan

$3,595,000

Interested in this property?
Active For Sale Condo

$3,595,000

$1,411 per sq ft

170 E 77th Street #6A

Lenox Hill, Manhattan

The Diamond House

MLS® #RLS20110714

RLS at REBNY

Listing by Compass

Open House Scheduled

Sunday, September 27 • 11:00 AM – 12:00 PM

REBNY 2025: signed Buyer Representation Agreement required before any showing.

4
Bedrooms
4
Baths
2,547
Sq. Ft.
1940
Year Built

Quick Summary

Bedrooms 4
Bathrooms 4
Living Area 2,547 sq ft
Lot Size 12,771.25 sq ft
Year Built 1940
Ownership Condo
HOA/Common Charges $3,710.53/mo
Property Taxes $36,930.72/yr
Neighborhood Lenox Hill
Floor 6 of 11

Property Highlights

  • Exposure: North facing
  • Climate Control: Central Air
  • Character: Pre-war building (1940)

Property Details

Type Condo
Ownership Condominium
Total Rooms 8
Baths 4 Full
Floor 6 of 11
Exposure North
Cooling Central Air
Pets Yes
Year Built 1940
Living Area 2,547 sq ft
Structure Type HighRise
Flooring Hardwood
Furnished Unfurnished
Lot Size 12,771.25 sq ft
Parcel # 1411-1124
Block/Lot 01411/7502

Listing History

Event Date Price Change
Listed Sep 22, 2026 $3,595,000 -
Currently Sep 22, 2026 $3,595,000 -

Description

Welcome to Residence 6A, an expansive 2,547-square-foot, loft-like four-bedroom, four-bathroom home with an in-unit washer/dryer, located in the heart of the Upper East Side within the full-service Diamond House condominium. A gracious entry foyer with double coat closets opens to a sophisticated dining gallery and an impressive step-down great room overlooking 77th Street. The spacious living area features beamed ceilings, beautiful hardwood floors, casement windows, and abundant natural light. The windowed eat-in chef’s kitchen is designed for both everyday living and entertaining, offering generous stone countertops, abundant custom cabinetry, a breakfast bar, and room for a dining table. Top-of-the-line stainless steel appliances include a Sub-Zero refrigerator and wine cooler, along with a Gaggenau cooktop and dual wall ovens. Thoughtfully designed with two separate bedroom wings, the home offers exceptional privacy and flexibility. The corner primary suite features an East-facing bay window, a wall of custom closets, and a luxurious en-suite marble bathroom with a soaking tub, double vanity, and separate glass-enclosed shower. The second bedroom, which also works beautifully as a home office, is conveniently located nearby and served by a full hall bathroom with a stall shower. The spacious third and fourth bedrooms each offer excellent closet space and their own full windowed bathrooms, with one enjoying en-suite access. The washer/dryer is discreetly located in the hallway of this bedroom wing. The Diamond House is a distinguished prewar condominium with full-time staff and an impressive array of amenities, including a beautifully landscaped roof deck, fitness center, and bike room. Ideally situated on the Upper East Side, the residence is moments from the neighborhood’s finest cultural institutions, restaurants, shopping, and convenient public transportation. A rare combination of scale, privacy, gracious entertaining space, and modern comfort in one of the Upper East Side’s most desirable locations. Taxes reflected include condo abatement.

Features & Amenities

Interior Features

Double Vanity Entrance Foyer High Ceilings Soaking Tub Common On Floor Common Area In Unit Flooring: Hardwood

Exterior Features

Building Roof Deck

Building Amenities

Bike Storage Concierge Elevators Fitness Center

Appliances

Cooktop Double Oven Dryer Dishwasher Freezer Gas Cooktop Gas Oven Range Refrigerator Stainless Steel Appliances Wine Cooler Washer

Building Information

Financial Details

Common Charges $3,710.53/mo
RE Taxes $36,930.72/yr ($3,078/mo)

Lenox Hill occupies a residential section of the Upper East Side, defined by proximity to Central Park, major medical institutions (Memorial Sloan Kettering, Weill Cornell, Lenox Hill Hospital), and the Madison Avenue retail corridor. Housing stock ranges from large pre-war cooperatives to modern condominiums with East River and skyline views.

Lenox Hill Live Market Data

View Neighborhood

Active Listings

614

Median Asking Price

$1.47M

Median $/Sqft

$1,587

Avg Days on Market

N/A

New This Week

54

Price Reduced

26%

Sold (30 Days)

78

Median Sale Price

$1.35M

Live data from RLS at REBNY • Updated 9/22/26, 7:09 PM EST

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Location

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170 E 77th Street #6A, Lenox Hill, New York County

Floor Plans

Floor Plan 1

Building Information

Official NYC property records for this building

1930
Year Built
96 years old
2
Floors
2
Residential Units
R3-1
Zoning District
Two Family Dwellings

Tax & Assessment

Assessed Value: $117,960
Land Value: $27,180
Exemptions: $0

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

Lot Area: 4,373 SF
Building Area: 2,460 SF
Built FAR: 0.56
Allowed FAR: 0.75

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 $3,710.53 per month. Confirm the exact amount with Milton Coste before making an offer.

The current listed annual property tax is $36,930.72, or roughly $3,078 per month. Verify the current assessment with your attorney before closing.

This property has 4 bedrooms and 4 full bathrooms.

The listed interior living area is 2,547 square feet. Verify dimensions independently during due diligence.

According to MLS records, the building was constructed in 1940, making it approximately 86 years old.

This listing is a condominium. Buyers receive a deed to their individual unit and own their space outright, subject to condo association rules.

Pet policy requires confirmation with Milton Coste.

At the current list price of $3,595,000 for 2,547 sq ft, the asking price per square foot is approximately $1,411. 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: RLS20110714
First Listed: 8/24/2026
On Market: 9/22/2026
Price Changed: 9/22/2026
Contract Date: 8/1/2026

Listing Courtesy of Compass - Allison L Chiaramonte

Listing Contact: (646) 248-0193

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 9/22/2026 at 11:09 PM UTC

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Lenox Hill Market Update

78 sales last 30 days · $1.47M median · 7.9 months supply

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New listings in this building

Quick Facts

Status Active Type Condo Neighborhood Lenox Hill Borough Manhattan
County New York
Floor 6 of 11
Year Built 1940
First Listed 8/24/2026
Living Area 2,547 sqft
Common Charges $3,710.53/mo
Annual Tax $36,930.72

Monthly Costs Estimate

Down Payment 20%

$719,000

Interest Rate Loading...

Source: Freddie Mac PMMS

Loan Term 30 years

Est. Monthly Payment

$0

Principal & Interest $0
PMI (under 20% down) $0
Common Charges $3,710.53
Est. Taxes $3,078
Total Monthly $0

Estimates only. Consult a lender for exact figures.

Mansion tax applies at this price point

New York State charges the buyer a mansion tax on residential purchases at $1,000,000 or more. At this asking price the tier is $3M to $4,999,999 at 1.50%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.

Estimated mansion tax at asking

$53,925

Run the numbers on a different offer price

Estimate based on the asking price. Confirm your own obligation with your real estate attorney.

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