I try to do floating floors over anything I'm suspicious of. 

You should consult a lawyer about this one.It's suspicious that they want to pay so much (up front).

Because of Garrett’s suspicious and sudden disappearance, my funder was not comfortable investing more money in Cincinnati and unfortunately, my funder did not agree to proceed to close on Sylvia’s property.Garrett betrayed me.

If cops come it would probably be an easier conversation than "I need to talk to you because you don't want to talk to me and I'm suspicious now." 

I'm always a little suspicious of people who have lied to me.

I'm looking at my first properties, and have been cautioned by a friend to avoid a duplex that looks good because it does not have a rental history.A granny owned the duplex, and since she died one of her adult grandchildren has been occupying the property, leaving the upstairs vacant.My general question is, do you look suspiciously at vacancies, or disregard them if you find suitable reasons for the vacancy??

The current owners checked "unknown", which in my mind, seems a little suspicious.

This way the seller won't get suspicious with all the people coming to look at it.

Putting aside the fact that the 80K property did not include interior pictures (which made me suspicious) any idea on why the price differences?

Not always mind you.Some people are just really suspicious, simply because I am black, and/or think everyone is out the to get them or... who knows.