NEW YORK—Alterra USA Holdings Limited, based in Dublin, has signed a 27,342-sq.-ft. lease to occupy the entire 16th floor at 1185 Ave. of the Americas. The space will serve as the insurance provider’s U.S. headquarters.

Scott Cahaly of Jones Lang LaSalle represented Alterra USA, while Howard J. Tenenbaum and Gary M. Rosen of SL Green acted on behalf of the landlord.

Situated between 46th and 47th streets, 1185 Ave. of the Americas consists of 1.09 million sq. ft. of space and stands 42 stories high. The property was recently updated to include upgraded lobby space and elevator cabs. It offers direct access to Rockefeller Center’s retail concourse. Other tenants at the property include King Spalding, Hess Corporation and the National Hockey League.