The U.S. Post OfficeâÂÂFederal Building (also known as the Social Security Building) is a historic site in Sarasota, Florida. The listing consists of two buildings: the Federal Building located at 111 South Orange Avenue and the U.S. Post Office building located at 1611 Ringling Boulevard. On March 22, 1984, these two buildings were added to the U.S. National Register of Historic Places as part of the Sarasota MRA (Multiple Resource Area).