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Deals & Dealmakers

ATCO Properties & Management welcomes Mount Sinai to 373 Park Avenue South

 ATCO Properties & Management announced today that it has finalized a 10-year, 17,464 square-foot lease with Mount Sinai to open a cardiology office at 373 Park Avenue South in the Flatiron District. The new lease encompasses the entire 11th and 12th floors of the boutique 12-story, 110,000 square-foot building, located on the southeast corner between East 26th and 27th Streets.

Mount Sinai is an integrated health care system that provides comprehensive medical care to local and global communities. Encompassing the Icahn School of Medicine and eight hospital campuses in the New York metropolitan area, as well as a large, regional ambulatory footprint, it is internationally known for its excellence in research, patient care, and education across a range of specialties.

“We’re thrilled to be able to accommodate Mount Sinai’s needs for its new cardiology center and provide the neighborhood with another important health and wellness amenity,” said Kate Hemmerdinger Goodman, co-president of ATCO Properties & Management. “373 Park Avenue South’s combination of classic architecture, modern infrastructure and prime location will make for a welcoming, convenient and efficient medical environment for patients and staff alike.”

Leonard Zimmerman at Hemsley Spear represented Mount Sinai in the transaction, while Kate Goodman represented building ownership in-house. Asking rent was $59 per square foot.

Built in the early 1900s, 373 Park Avenue South benefits from a prime location near Madison Square Park, restaurants, and multiple subway lines. Major tenants at the property include Simplebet, LaunchSquad, Neuehouse. Advanced Focus, and Lifetime Brands Inc. Retail tenants include Mexican restaurant Dos Caminos.

The building offers 8,732 square-foot floor plates. Available commercial space includes fully built out space on the 2nd and 6th floor with western views that allow for sunny exposures and low loss factors. Certain suites include exposed brick walls.

For more information on ATCO, please contact 212-687-5154 or visit

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