Alfred E. Clarke Mansion , also known as Caselli Mansion , Nobby Clarke 's Castle and Nobby Clarke 's Folly , is a mansion in San Francisco , California , located at 250 Douglass Street in the Castro neighborhood . The Clarke Mansion survived the 1906 San Francisco earthquake and subsequent fires which had destroyed many of the Victorian mansions from the same era . On December 7 , 1975 , it was designated a San Francisco City landmark . The mansion was used briefly as a hospital . Today , it is used as a rental property , with 15 apartments
1906 San Francisco earthquake
1906 San Francisco earthquake
Alfred E. Clarke Mansion