Smithsonian Hall, the only cast-iron building in Greenpoint, was built by Edward Smith, of Smith, Gray & Co. Gray tapped William F. Gaylor, architect for Smith, Gray & Co.'s Broadway cast-iron buildings, as the architect for this project.1
Source: Real Estate Record & Builders' Guide (vol. 14, no 337, August 29, 1874), 146.
Real Estate Record and Builders' Guide, v. 35, no. 890 (April 4, 885): 383