People like @Hunter L. spend a lot of time going to school to know things like that.Anyone making statements like that without proof seems to be simply trying to secure a listing and not acting in your best interest.  

Clearly he provided a fake letter just to lock the contract up and never had any intention of funding it.It is not out of the question for you to ask the HML for some sort of proof of funds to ensure he is a legitimate lender and actually has funds available.  

Fact is tenants are not predictable, there is no factual proof to support the statement that they stay longer.

The banks will take 2 years of tax returns as proof of income if you're self employed. 

It is not completely airtight as they could ask for proof it was used as a separate apartment and not used by the homeowner.

Account Closed I definitely don't want to do anything illegal but I do want proof of income from one business for two years. 2016 was my first year and I need two tax returns in order to get approved for a mortgage, which is very important to me right now.

The product is 100% water proof and snapped together right over the concrete.

I love to hear them argue a higher price when they have zero proof to support it and my offer is 100% supported by fact.

@John Thedford ask to see every check and invoice currently paid or pending on the project , to justify the current scope of work and then demand proof of a lien release from each.

It is VERY easy to do, and back up with proof if necessary, if you prepare it at the time of the short sale.