Did you just post and mail notices, or let them know in person as well?  

There is a great community of investors in Grand Rapids, both on BiggerPockets and in person!  As

Talk to your bank and mortgage person. As

Some of the more bizarre: A window for an old Jeep Cherokee was left behind (found behind a door).A new, crated shower stall was once left in my parking lot (there was some weird story behind it like the tenant had intended to use for an in-laws remodel).Too many artificial x-mas trees to count.A machete (under a mattress)On a turnover, I once vacuumed under a refrigerator of a condo and just kept sucking up dried up dead small birds the tenant's cat had hunted and left behind.

As @John Warren mentions, tire kickers are a hazard of the business for real estate agents.One of the problems that I can see with signing an agreement like this is that you are limiting yourself by relying on one person. As

Person A bought a house for $200,000, but needed additional credit to purchase. 

(M as in Margrave) - I'm sure your tenants will appreciate take advantage of your largesse ...

Welcome Mas.

The fact someone dresses nice, and drives a nice SUV doesn't make them a bad person, a bad contractor or anything else.

Give that person a regular 3 day notice to evict along with any UNKNOWN TENANTS OR a 7 Day Notice for breaking the lease,for SUBLETTING  and moving everyone in.