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 practice at 373 Park Avenue South in the Flatiron District. The new lease covers all 11and and 12and floors of the 12-story, 110,000 square foot boutique, located on the southeast corner between East 26and and 27and 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 outpatient footprint, it is internationally known for its excellence in research, patient care and education across a range of specialties.

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

Leonard Zimmerman of Hemsley Spear represented Mount Sinai in the transaction, while Kate Goodman represented ownership of the building internally. The asking rent was $59 per square foot.

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

The building offers floor plates of 8,732 square feet. Commercial space available includes fully finished space on the 2nd and 6th floors with westerly views that allow for sunny exposures and low shedding factors. Some suites have exposed brick walls.

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

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