Friends, when Loudmouthed Business Guy "allows" you to adorn his personal property, you're being used. First of all, let's hope you're getting paid. (Between Daddy and Mommy's money and helping destroy this city he's definitely got the dough. Just ask him!)
This leeching douche has no artistic or design ability of his own and so he's using you as his unofficial PR staff. He's trying to point to you and your work as proof that he's A Really Cool Guy, and not just another boring yuppie carpetbagger. He wants people to think he's got some kind of indy boho cred because you let him hang around you.
All he's got is money. You've got what really matters. Don't let him steal it.