I suggest that you try this -
Send an e-mail to the main Palo Alto public library, attn: Reference Librarian.
Give her/him the info you have (name of business, in business in the 1970s), and ask her/him whatever you want to know... years in business, address(es) of business, principal owner(s), did it change business names and continue on, and perhaps is still in business under another name?, etc.
Reference librarians are very good at answering such questions.
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