Other Owner Absentee Businesses

I would to hear from others about ideas for owner absentee businesses, either ones you are involved in or just ideas. I just started buying rental houses last year and just recently got a management company but I know in the future I would like to diversify into different types of businesses. Here are some of my ideas
Obviously there are alot of owner absentee franchises for just about anything- anyone here a franchisee?
Carwash
Self Storage
BIllboard rental?



-Nick