Is this daydream territory or serious? Because I don't really have an idea or intention to start one.
Daydream wise, I'd love to open a book / coffee shop - you know like how there is a Costa in the back of big waterstones? Except I imagine, because they'd both be owed by me, you could pick up anything you fancy from the bookshelves and read in the cafe, and either buy it at a discount, or, with a bigger discount donate to the cafe shelf.
The coffee shop would also be open late at night so it would be on mezzanine looking over the bookshop, with a little balcony so people could come in from the street, (and a kind of 2 entrance lift for disabled access). We could close off the bookshop bit at night, but the cafe staff would be able to fetch a book for someone if they really needed it. Occasionally, we could have music nights, or if we get lots of students in a university town perhaps we could have a guest lecturer do a talk, really light and informal though....
Maybe I've thought about this too much