The Carnegie Hill Historic District is defined by its unique mixture of late nineteenth- and early twentieth-century rowhouses and early-to-mid twentieth-century apartment houses.  HQ served as historic preservation consultants to the Tamarkin Company for a new apartment building to replace an existing one-story bank in the historic district.  The project required approval by the New York City Landmarks Preservation Commission.  HQ worked with Platt Byard Dovell & White Architects to ensure that the limestone and brick building would complement the historic neighborhood context.  The construction took place while the bank remained in operation.  Today, 47 East 91st Street functions as luxury condominiums with a bank on the ground floor.