This is a rocky, partially tree-covered open area with a view of the city, particularly if access from the "T" intersection of Duncan and Castro.
The Duncan/Castro Open Space is owned by the San Francisco Recreation and Park Department.
24-Divisidero -- Noe and 27th Streets. Climb the stairs; 27th St. continues at the top. Walk along 27th St. to Newburg St. Go left on Newburg, then left on Duncan to Castro. The park will be on your left.
35-Eureka -- Diamond and Duncan Streets. Walk east on Duncan, past Newburg, to Castro; the park will be on your left.