The Man Who Cheated Himself - Lois Frazer's Home
Ed responds to Lois’s plea for help, driving over to her home - it’s seen several times throughout the movie. The address in the movie is 2370 Del Mar and indeed the front entrance is so numbered.
Then … Ed pulls into the driveway, giving us a wider view of the home’s exterior including an interesting old-style street lamp. There’s an upstairs balcony over the entrance supported by decorative metal posts, seen up close above.
… and Now, the house has hardly changed in over 70 years. Even the street lamp is still there. But it’s not in San Francisco - this is 2370 N. Vermont Avenue in Los Feliz, a hillside neighborhood in the greater Hollywood area of Los Angeles (map). Last sold in 1973 for $80,000, the home is currently valued at over $4 Million.
Then … In another scene we see the entrance from a different angle, revealing more of the house.
… and Now, from here we can see one small change: a pair of railings, matching the original posts in style, have since been added on the steps.
Lois lets him in. She’s in a tizzy as she pours out some startling news. The expansive interiors of the Frazer home were most likely filmed on a sound stage at the General Service Studio in Hollywood (in which case they did a nice job here matching the front door with its sidelites; compare it from the outside in the first image above).