Does he need a kitchen? How about just a fridge and microwave? Does he want to pretty much be left alone or actively participate in a household, common areas , kitchen etc. Maybe doesn’t matter too much either way?

buy him a condo. you can sell it for the same price or more after he graduates.

Have a good friend that owns a house near sdsu and rents a room or two. Professional, really solid character, would be a good influence for your son. PM me if you’d like his contact info.