Mariner, a New York City-based asset management company, has signed a 10-year lease for 5,679 sf of space for its new headquarters. It will relocate from its offices at 65 East 55th St. in Manhattan this December. W&M Construction will build out the space at 500 Mamaroneck, which has a total of approximately 285,000 sf of space.

Newman and JoAnn B. McGrath, W&M Properties’ vice president of leasing and marketing, represented the building owner, an entity of the Malkin family. Douglas J. Furer, president of Mariner Real Estate Services, L.L.C, represented Mariner.

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