I know some, but not all locations in LA, lets get as many as possible movie sets in Los Angeles. Here are some just to start:
Hollywood Hotel (1937) filmed mostly in Hollwyood featuring Hollywood hotel at Hollywood and Highland, torn down in 1956.
Sunset Blvd., (1950) filmed on Sunset Boulevard, Paramount Pictures in Hollywood.
LA Confidential (1998) filmed at Formosa Cafe, LA City Hall, Echo Park, Hollywood Center Motel, Pantages Theater