In condo conversions like Philip House at 141 East 88th Street, developers are riffing on the prewar character of buildings made famous by architects like Emery Roth. New buildings at 135 East 79th Street and at 200 East 79th Street use limestone facades and traditional elements, like the street-level window grilles at 135 East 79th Streets being built with prewar touches. 135 East 79th Street that the architect William Sofield says were made by the manufacturer of the gates at Buckingham Palace.