Re: this image, I contacted the Old Riverside Foundation, their site is here.....
https://oldriverside.org....I asked for their help in identifying the location.
Within minutes I had a reply from the Old Riverside president, Dave Stolte, who responded as follows....
"Hi -
It doesn’t look immediately familiar. I don’t see any recognizable architecture, geographical features, or business names. A search for “The Nook” antique store came up short, and it’s not listed in the 1939 city directory. The photo might be misattributed."
So we might have another misidentified location on our hands.
Dave supplied a link to an interesting project one of his board members is conducting, they are locating vintage photos to an interactive Inland Empire map:
https://yesterdays.inlandempire.place
I thanked Dave for his help and rapid response.