164 & 170 Prospect Street, Queen Anne Hill, Seattle, Washington. 170 Prospect Street (on the right) is the Brace/Moriarty House, an official city landmark. It is somewhat ambiguous whether this block is on Queen Anne Boulevard. The ordinance designating the boulevard would seem to include this block, but the signs indicating the boulevard begin just east of here where N. Bigelow branches off of Prospect at a 45° angle.