The Louis Johnson Building (also known as the Johnson Building) is a historic site in Largo, Florida. It is located at 161 1st Street, Southwest. On December 3, 1987, it was added to the U.S. National Register of Historic Places.The building was originally built as a hotel by Louis Steele Johnson in 1911. In the 1950s, the hotel was converted to the Johnson Brothers Auto Machine and Supply Company.