One comment, from AB, cites a 1985 interview: Jobs indicated that the practice of philanthropy was more demanding than most billionaires would tolerate. There's more to it than giving a sum sufficient to get your name on a building.
Interviewer: You could spend all of your time disbursing your money.
Jobs: Oh, you have to. I'm convinced that to give away a dollar effectively is harder than to make a dollar.
Want a Steve Jobs building? Here's the amazing spaceship come to earth that will become Apple's new campus. I'm guessing that Cupertino will consider it a contribution to the civic good.