Sudden Fear - Irene's Apartment
Myra's new-found happiness comes crashing down when she overhears Lester and Irene scheming to kill her for her money - captured by her dictating machine that had been inadvertently left on.
Then ... After she gets over the shock her playwriting skills kick in and she begins to formulate a plan to beat them to it, requiring her to gain entry into Irene's apartment. Below, she makes her way there.
... and Now, the Tamalpais Apartments building at 1201 Greenwich Street really does exist on the corner of Hyde Street on Russian Hill (map). The signs are no longer there but there are still traces of the mounting screws.
... and Now, if you go up those steps, above, you will see the building name displayed alongside the main entrance, below. On a trivia note, this building appeared in the 1947 movie Dark Passage when Humphrey Bogart climbs down its fire escape.
Then ... Myra walks up from Hyde Street and heads for Irene's door at the rear of the apartment building. In the distance Greenwich Street climbs up Telegraph Hill to Coit Tower.
... and Now, the hedge has been extended up the slope from the street and a wrought iron fence has been added at far right to create a secure parking area for the tenants.
Then ... She uses a copy of Irene's door key to gain entry. This doorway was most likely part of the studio set used for the apartment interior scenes.
... and Now, the real rear door is used for deliveries.
Inside the apartment Myra finds some monogrammed note pads and a gun, soon to be used in her punitive strike.