"Old" Ascot Park? "About 63rd Street, East side Los Angeles?" (May be marked early 1900's, but based on the cars and cameras, more likely late teens, if not later.)
http://sunsite.berkeley.edu
"Barney Oldfield races his front-drive Christie against a Curtis bi-plane at the old Ascot track (1913)"
http://jpg2.lapl.org/pics28/00048898.jpg