(Photo: National Parks Service – National Register Nomination) Name: Halprin Open Space Sequence, including Keller Fountain, Pettygrove Park, and Lovejoy Fountain Address: SW Open Spaces and Pedestrian Malls from Lincoln Street to Clay Street City: Portland Year of Construction: 1966-1970 Landscape Architect: Lawrence Halprin Original Use: Park / Plaza National Register of Historic Places:…