There were several scenes in the movie in Archie's apartment, all filmed on location at 307 Filbert Street on the Filbert Steps. In order to have a large enough space for the shoot the adjacent second floor apartments, B and C, were combined into one by opening a wall between them.
Then ... This panoramic composite captures Archie's living room with the front door to the right. Appropriately for a bachelor, there's a tiny kitchen, This is apartment C of 307 Filbert.
... and Now, below is apartment C today, not a whole lot different except for an updated kitchen and a more contemporary decor.
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Then ... this is a view from the same living room looking towards the front door. Archie's bedroom is seen through the wall opening exposing the adjacent apartment B.
... and Now, the same apartment C view today with the wall opening filled in, back to normal.
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Then ... This view shows Archie up in his loft.
... and Now, the loft is the bedroom in apartment B.
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Then ... And this is what Archie sees looking down from the loft to Petulia who has spent the night in his bed.
... and Now, the same view today in apartment B. Its living room was converted to the bedroom for the movie, necessitating removal of the fireplace which is seen here back in its normal position. Note the same fluorescent lighting strip, still there below the loft railing.
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Then ... And finally, here's a view from the bed looking towards the wall opened up for the movie, with apartment C visible through it.
... and Now, the same wall of apartment B (below) has a door which was hidden by the bookshelves in the movie (above). On the right is this apartment's kitchen, masked by fake closet doors for the movie (there's a better view of them above in the second 'Then' image from the top). Cleverly done.
After the picnic in the park Archie brings his friend May to his apartment, 307 Filbert Street on the Filbert Steps in the Telegraph Hill neighborhood.
Then ... When they arrive, just a few steps up from Montgomery Street, Petulia is waiting for them and she has brought somebody along with her.
... and Now, today's view looks as it did then with a view of the Bay Bridge and Yerba Buena Island across the Bay.
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Then ... Petulia has brought Mr. Howard of the Companions of the Evergreen Lodge to retrieve the tuba. Archie's apartment entrance, number 307, is behind him.
... and Now, other than the railings these two buildings (below) haven't changed in over 40 years. The Christmas tree adds a seasonal touch - coincidentally one of the interior apartment scenes later in the movie is at a Christmas gathering.
Bigelow has been told he only has days to live because of a poison in his system. In disbelief he rushes to another doctor for a second opinion.
Then ... This is the Southern Pacific Hospital at 1400 Fell Street at Baker in the Haight district, facing Golden Gate Park's Panhandle. It was built in 1908 by the Southern Pacific Railroad as a medical center for its employees throughout the West.
... and Now, the hospital eventually became uneconomical and was sold in 1968, becoming the Harkness Hospital. It was finally closed down after several years of large losses. It now houses Mercy Terrace, a senior housing retirement facility.
... and Now, here's another view of the imposing structure today.
The second doctor confirms the diagnosis. He dramatically turns out the light to show the lab sample glowing in the dark - a luminous toxin. Again, a dumbstruck Bigelow hears that he has at most one week to live. Not one to mince words, the doctor tells him "You've been murdered".
Bigelow has been slipped a Mickey Finn at the Fisherman Club and is not feeling well the next morning. He goes to see a doctor on Nob Hill.
Then ... He takes a cable car from his hotel, the St. Francis, up Powell Street and jumps off at California. The Alta Casa apartment building at 897 California is on the corner behind the cable car, as is the cone-roofed cable car control booth (click image to enlarge).
... and Now, the same view today, east down California, now has modern high-rise offices down California in the Financial District. The Alta Casa apartment house at right has been demolished but the control booth is still there because this cable car line is still in operation, as is the brick-walled University club at left, there since 1908.
Then ... In this south-facing view down Jones Street from Sacramento, Bigelow is about to cross the road to the doctor's office kitty-corner from where he is.
Then ... He reaches the office, at 1298 Sacramento, corner of Jones. The view looks east down Sacramento. Grace Cathedral on the right is under construction with only one tower and the Fairmont and Mark Hopkins hotels can be seen in the distance on Mason Street.
... and Now, the completed cathedral has two towers. The added Fairmont Tower rises behind the hotel, otherwise the view is quite similar.
... and Now, 1298 Sacramento, known as the Chambord Apartments (below left) was built in 1921. Its ornate flowing design by architect James Francis Dunn evokes the style of the Chateau de Chambord in the Loire Valley of France (below right).
Bigelow is horrified to learn from the doctors (below) that he has a toxic poison in his system and only has days to live. He accuses the doctors of being crazy and storms out of the office.