View north on Leavenworth near Filbert, Alcatraz and Angel Island in background. The octagonal house in left distance, one of five in the city, was built in 1859 for Arden Ellis, a laborer, at the northwest corner of Lombard and Leavenworth. [SC49][Leavenworth St. North of Filbert St.](Date is based on Alcatraz’ profile, which shows a large plateau at the SE end of the island that was excavated in the 1870s.)