There isn’t much to really say here, except that this is why snapshots are great.
The camera in at least the woman’s hand in this great shot looks to me to be a 1920s Kodak Brownie No. 3, Model B. According to what I have found online, the camera was produced from 1908 – 1934, but the trigger guard visible below her thumb was added to the Model B from 1920 – and the rest appears to match that particular camera, as shown below.
This shot is dated February 11, 1930, notes the streets on the back and also mentions “Bay in background” – and you can indeed see it if you enlarge the photo enough. A quick check online reveals that unfortunately nothing in this photo seems to exist today. The block in the middle is open space, and the surrounding streets are occupied by the typical contemporary mishmash of larger buildings. Another step “forward” in American urban planning.