Petulia - Petulia's Residence
This one is especially interesting. For the home of Petulia and David Danner director Lester combined two separate locations several miles apart and even duplicated one of the structures to achieve continuity between the sites. Below, Archie visits the home and we see him arriving at the carport.
Then ... The carport has a lovely cross-bay view to Sausalito and the Golden Gate Bridge, probably why this location was chosen.
... and Now, the carport was at 401 Belvedere Avenue on the island of Belvedere right where Pine Avenue joins it (map). Below, the only part of it remaining is the concrete pad (seen under the car's rear wheels above) and exposed foundations down the hill. 401 Belvedere has been a derelict lot for decades.
Then ... In a later scene Petulia and her young Mexican friend Oliver exit the house and approach her Rolls-Royce parked in the carport (the entrance gate, below, can also be seen at the far right of the movie capture above).
... and Now, this scene was filmed at this same roadside spot at 401 Belvedere Avenue.
... on location ... The cast and crew are seen in the carport during the filming of the scene.
Then ... In the movie the carport connects down the hillside to the house by way of a funicular platform. Below is a view of the house from the bottom end of the funicular ...
... and here's the top of the funicular, looking up from the house. Note the structure next to it to the right, meant to be the carport.
... and Now, but this house is located miles away, across the bay from the carport! Out of respect for owner privacy considerations CitySleuth is refraining from revealing its location, other than to say it is in Tiburon. It would appear that the moviemakers built the funicular and carport here exclusively for these scenes.