Milton Coste

Licensed Real Estate Associate Broker

(917) 416-7433
834 5th Avenue #MAIS-C

For Sale · Listing by Sothebys International Realty

834 5th Avenue #MAIS-C

Lenox Hill, Manhattan

$14,995,000

Interested in this property?
Active For Sale • Co-op

$14,995,000

834 5th Avenue #MAIS-C

Lenox Hill, Manhattan

MLS® #RLS20118309

RLS at REBNY

Listing by Sothebys International Realty

6
Bedrooms
4.5
Baths
N/A
Sq. Ft.
1931
Year Built

Quick Summary

Bedrooms 6
Bathrooms 0 full, 2 half
Lot Size 16,546.2 sq ft
Year Built 1931
Ownership Co-op
Maintenance $14,376/mo
Neighborhood Lenox Hill
Floor 1 of 16

Property Highlights

  • Views: City, Skyline
  • Exposure: East,North,West facing
  • Fireplace: 1 fireplace

Property Details

Type Co-op
Ownership Stock Cooperative
Total Rooms 11
Baths 4 Full, 2 Half
Floor 1 of 16
View City, Skyline
Exposure East,North,West
Cooling Central Air, Other
Pets Yes, CatsOk, DogsOk
Year Built 1931
Structure Type HighRise
Flooring Hardwood
Furnished Unfurnished
Lot Size 16,546.2 sq ft
Block/Lot 01379/0001

Listing History

Event Date Price Change
Listed Sep 30, 2026 $14,995,000 -
Currently Oct 1, 2026 $14,995,000 -

Description

There exists but a very limited number of grand duplex maisonette apartments in Fifth Avenue’s finest buildings. This glorious and glamorous maisonette is such a rarity. Located at 834 Fifth Avenue, among the Upper East Side’s most coveted addresses, and designed by master architect, Rosario Candela, this residence is truly splendid. Blessed with pleasing scale, soaring high ceilings, elegant proportions, and delightfully sun-flooded interiors, this duplex offers the discretion and privacy of a fine townhouse as well as the security and service provided by a building of this caliber. Notably in this divine apartment, every major room of this duplex faces onto Fifth Avenue and offers delightful treeline outlooks of Central Park. The apartment features two entrances, one from each floor of the building’s interior, the other its own private entrance (and address) on Fifth Avenue. A separate service entrance through the building ensures that deliveries are discreetly managed and escorted by the building’s back-of-house staff. From its private Fifth Avenue entrance, the classic and very grand Gallery has an attractive stone floor and is anchored by a gracefully curving staircase. Coat closets and a powder room are conveniently accessible. The Gallery opens to two entertainment rooms, both overlooking Fifth Avenue: a sumptuous, wood-paneled Library with a woodburning fireplace, and an elegant Dining Room. Beyond, a large eat-in Kitchen, designed for the consummate chef, is perfect for extremely comfortable daily life but also scaled to accommodate a large catering crew and chef when for grand entertaining. Above, the second floor presents a magnificently-scaled step-down Living Room with a wood burning fireplace and marvelous oversized windows looking onto Central Park. On this level, there are also three large Bedrooms, two of which stretch along Fifth Avenue with leafy outlooks. Each has an ensuite bath and a copious dressing closet. A third very generously-scaled Bedroom is nearby and also has an ensuite bath and ample closets. Beyond, there are three staff bedrooms- two of which could easily be combined to create a large fourth Bedroom. A large storage bin, a private basement laundry room, and a wine vault are also included. Designed by the esteemed Rosario Candela in 1931, 834 Fifth Avenue is notable for its restrained and elegant neoclassical limestone façade. Representing the highest standard in refined and luxury living, this stately building was constructed to include a preponderance of duplexes along with a penthouse triplex and three duplex maisonettes. Impeccable staffing at this white-glove cooperative include a fully attended lobby, with a full-time doormen, porters, and elevator attendants, and residents benefit from a well-appointed and recently renovated fitness suite. There is a 3% flip tax payable by the purchaser, and financing is not permitted. Pets are welcome. This listing is a co-exclusive.

Features & Amenities

Interior Features

Common On Floor Common Area In Unit Flooring: Hardwood Fireplace (1)

Building Amenities

Elevators

Appliances

Dryer Dishwasher Washer

Building Information

Building Data View Compliance & Permits
Total Units 24
Stories 16
Structure HighRise

Financial Details

Maintenance $14,376/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

657

Median Asking Price

$1.20M

Median $/Sqft

$1,475

Avg Days on Market

N/A

New This Week

33

Price Reduced

29%

Sold (30 Days)

75

Median Sale Price

$1.24M

Live data from RLS at REBNY • Updated 9/30/26, 8:40 PM EST

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Location

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834 5th Avenue #MAIS-C, 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
14
Floors
24
Residential Units
R10
Zoning District
Elevator Apartments Historic District: Upper East Side Historic District

Tax & Assessment

Assessed Value: $25,552,800
Land Value: $7,155,000
Exemptions: $21,600

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

Lot Area: 16,680 SF
Building Area: 187,270 SF
Built FAR: 11.23
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 $14,376 per month. Confirm the exact amount with Milton Coste before making an offer.

The current listed annual property tax is $0, or roughly $0 per month. Verify the current assessment with your attorney before closing.

This property has 6 bedrooms and 4 full bathrooms and 2 half bathrooms.

According to MLS records, the building was constructed in 1931, making it approximately 95 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: UnitYes. Contact Milton Coste for weight limits or breed restrictions.

To schedule a private showing, contact Milton Coste at (917) 416-7433 or milton@miltoncoste.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: RLS20118309
First Listed: 9/30/2026
On Market: 9/30/2026
Price Changed: 9/30/2026
Contract Date: 9/30/2026

Listing Courtesy of Sothebys International Realty - Serena Boardman

Listing Contact: (212) 606-7611

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 10/1/2026 at 12:40 AM UTC

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Milton Coste - NYC Real Estate Broker

Milton Coste

Licensed Real Estate Associate Broker

Keller Williams NYC

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Sale history, taxes, violations and comps for this unit

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Lenox Hill Market Update

75 sales last 30 days · $1.20M median · 8.8 months supply

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Quick Facts

Status Active Type Co-op Neighborhood Lenox Hill Borough Manhattan
County New York
Floor 1 of 16
Year Built 1931
First Listed 9/30/2026
Maintenance $14,376/mo

Monthly Costs Estimate

Down Payment 20%

$2,999,000

Interest Rate Loading...

Source: Freddie Mac PMMS

Loan Term 30 years

Est. Monthly Payment

$0

Principal & Interest $0
PMI (under 20% down) $0
Maintenance $14,376
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 $10M to $14,999,999 at 3.25%, applied to the whole purchase price. It is due in cash at closing and cannot be financed.

Estimated mansion tax at asking

$487,338

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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