Last updated on Apr 3, 2026
343 East 78th Street
Charming Upper East Side co-op with spacious duplexes featuring wood-burning fireplaces, exposed brick, and modern updates including in-unit laundry. Located on a quiet, tree-lined street with excellent transit access, offering classic New York charm and contemporary convenience.
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- Recent Sales (1)
- All Units in Building (12)
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Overview of 343 East 78th Street
343 East 78th Street is a charming co-op building located in the heart of the Upper East Side, known for its tree-lined streets and proximity to various amenities. The building features a selection of duplex apartments, many of which boast unique characteristics such as wood burning fireplaces, exposed brick, and garden views. The residences typically include modern updates, with renovated kitchens and bathrooms, and in-unit washer/dryer facilities, making them both comfortable and convenient for urban living.The apartments often feature spacious layouts, with high ceilings and ample storage options, including hidden nooks and large closets. Many units are designed with a split-level layout, providing a distinct separation between living and sleeping areas. The second floors of these duplexes often accommodate large bedrooms that can fit king-sized beds, along with luxurious bathrooms that may include soaking tubs and heated towel racks.
Residents enjoy easy access to public transportation, with the Q and 6 subway lines just a few blocks away, as well as a variety of grocery stores, dining, and shopping options nearby. The building's location on a quiet street enhances the appeal for those seeking a peaceful urban retreat. Pets are permitted, although dogs are not allowed, making it a suitable choice for cat owners.
Overall, 343 East 78th Street offers a blend of classic New York charm and modern conveniences, making it an attractive option for both long-term residents and those seeking a pied-à-terre in the city.
Doorman
None
Type
Co-op
Year Built
1910
Converted:
1984
Apartments
Floors
5
Neighborhood
Lenox Hill (Manhattan)
Min Down
20%
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- 6
Sales History
Price/Room (Est)
Why are we displaying the estimated price per room?
For some co-ops, instead of price per square foot, we use an estimate of the number of rooms for each sold apartment to chart price changes over time. This is because many co-op listings do not include square footage information, and this makes it challenging to calculate accurate square-foot averages.
By displaying the price per estimated room count, we are able to provide a more reliable and consistent metric for comparing sales in the building. While we hope that this gives you a clearer sense of price trends in the building, all data should be independently verified. All data provided are only estimates and should not be used to make any purchase or sale decision.
Price/Ft2 (Est)
Sales Summary
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at the southeast corner of Third Avenue
Lenox Hill
A remarkable blend of classicism and contemporary sensibility. Spacious two- to six-bedroom homes on the Upper East Side. Delivery summer 2025
- 5 beds starting at $18,500,000
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RLS IDX Data display by CityRealty.com, LLC.
This 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.
IDX information is provided exclusively for consumers' personal, non-commercial use and it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.
All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.
All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.
CityRealty is committed to ensuring digital accessibility for individuals with disabilities. We are continuously working to improve the accessibility of our web experience for everyone, and we welcome feedback and accommodation requests. If you wish to report an issue or seek an accommodation, please contact us at accessibility@cityrealty.com.
All information furnished regarding property for sale, rental or financing is from sources deemed reliable, but no warranty or representation is made as to the accuracy thereof and same is submitted subject to errors, omissions, change of price, rental or other conditions, prior sale, lease or financing or withdrawal without notice. All dimensions are approximate. For exact dimensions, you must hire your own architect or engineer and for no listing shall the number of bedrooms listed be considered a legal conclusion.
All closed sales data has been provided by the New York City Department of Finance via the Automated City Register Information System (ACRIS). No warranty or representation is made as to the accuracy of any data provided by ACRIS or any other sources.
CityRealty is committed to ensuring digital accessibility for individuals with disabilities. We are continuously working to improve the accessibility of our web experience for everyone, and we welcome feedback and accommodation requests. If you wish to report an issue or seek an accommodation, please contact us at accessibility@cityrealty.com.
An equal housing opportunity 
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