I think this is suspicious too. 

I was suspicious for weeks, as I had gone about 6 weeks without seeing my tenant's car (I was there daily doing a renovation in another unit) but would quite regularly see her sister coming and going.  

Question anything that seems suspicious. 

To address this, we verify the property owner per government records and use this information to vet imposters.Anything that seems suspicious will lead to us requesting an acceptable Letter of Explanation to address.Analyze IncomeMany landlords require a month of paystubs from applicants and just use these to calculate a monthly qualifying income.

If experts can't find mold, I would be suspicious. 

I've already uncovered several lenders that were absolutely not legit or suspicious at the least from FB. 

Yeah, they do it in high end rentals too...they are less suspicious that way.

We are suspicious of his actions and we found out that he made offers on our behalf without our approval. 2.

One potential lender has attractive terms (8%, 2 points, 100% financed, no prepay penalty), but on the phone he has very spotty English so it's hard to talk to him, and his contract seems suspicious in areas too.

@Tony Karns I would be very suspicious of a duplex listed on the market at $360k where market rents would be 1% or more.