High end rental ADU

[Miho Y.]

A friend of mine is a first time landlord in a highly sought Venice, CA. It's 3/1.5 SFH with a newly built ADU where he's moving to. The rent will be market rent just under 6.5K/mo. The test ad attracted the super riches offering to buy his property instead of the tenancy which kind of freaked him out. I feel his fear because they probably have power to do whatever they feel like to (remember oj Simpson), probably more powerful than him. How do you make sure of the tenant profile in such a high end neighborhood? What do you think is the verbiage to include in the ad to protect yourself from the entitles rich?