Locations for getting work done that are private/not crowded?

Does anyone know of affordable office spaces or something similar for long-term work? I've explored private rooms in libraries, but most have time limits. I've also inquired about office spaces, but they're quite pricey and I don’t have a business or anything. I just need a peaceful place to work without disruptive noises, as my home isn't ideal. Currently, I'm working in my car or at random parking lots and parks, but I want a better solution. If anyone has alternative ideas that I may not have thought of, please share.

Location preferably near Rancho but it can also be Riverside, Corona or anywhere near there.

Thanks in advance!