 Complete the following phrase:  One prominent civic commission was the seamless extension, to north and south, of the New-York Historical Society building on Central Park West between 76th and 77th Streets, carried out in 1938. York and Sawyers central block dating from 1908 was extended and sympathetically completed by pavilions on either end. This project stands among the last examples of Beaux-Arts architecture completed in the city and in the entire country. In sharp contrast the firms most theatrical modernist building came the same year. That was the Electrical Products Building for the 