Convinced that Lisa will lead him to the suspect, Ripley decides to tail her.
Then ... She takes a 38 Geary Muni bus and gets off at the Kaiser Foundation Hospital at 2425 Geary on the corner of St. Joseph's Avenue in the Anza Vista neighborhood (map).
... and Now, a recent photo shows those same two houses across the street (2448 and 2454 Geary) and a 38 Geary bus, continuing to serve this busy thoroughfare.
Then ... She alights from the bus and the camera tracks to the left as she enters the hospital, set back from the road.
... in 1957 ... The hospital was opened in 1954 - here's a wider view in this photo, taken not long before the movie was filmed.
... and Now, Kaiser Hospital appears to have an addition where the setback and parking lot used to be.
In the hospital Ripley finds that she is visiting her handicapped son Joey, recovering from hip surgery. He discovers why she is so reluctant to talk about Lynch. He has been good to Joey, even paying the hospital bills. But she refuses to say any more.