I'd open a bookstore/cafe that sells tech and engineering books. We'd run tech classes in a space in the back, with a discount for vets and artists looking to change careers. I'd live in the apartment above the store, with a garden on the roof. The wifi would be phenomenal.
What is the point of owning tech books when a) much of the content is online and b) there are new developments in languages/frameworks all the time?
Fundamentals are still better off starting with a book before moving to online imo.