The most interesting thing in the article to me is that there was a dual library/bookstore, and that it’s privately owned. I don’t think I’ve encountered a library that wasn’t publicly owned in the US.
There is a private engineering library I visited in TN (anyone can drop in during business hours) that aims to preserve books that engineers used before everything became computer assisted.
At least in California, libraries often have a community run used bookstore whose proceeds are used to help the library run community programming.