He called the installer personally to send photos and verify the work.What was the outcome?

If payroll is additional, verify their wage and hours worked per week.

YouTube videos and alliterative catch phrases won’t make this deal any safer for them.Sorry Jesus, but if you can’t find a professional lender willing to fund this deal using a sensible valuation that includes verifiable repairs, you shouldn’t be "dialing-for-dollars" asking your friends and relatives.And no, a private money loan, is still a loan.

If not, any other recommendations for verifying the status of the senior line? 

This is referred to as "abandonment" and you need to know what your law says about it.Lawyer opinion on Abandonment in TexasYou'll have to research this and verify it yourself.Typically, the abandonment is very obvious.

If it is a larger project scope that will take several weeks or months, setup a schedule of values in which to pay them off of verified progress.

If your offer is accepted then you can verify your estimates (assuming you have an inspection contingency or due diligence period).Either way, as far as negotiating, you want to understand their motivation. 

What you mean is when i analyze a deal i must verify it cashflow so if the market downturn the rents usually do not drop or slightly drop so i can still profit from the cashflow?  

Have you verified those rates recently? 

Is there a good way to verify I'm doing them correctly?