@Jonathan Greene, I did use my VA once on a previous property, not sure how it would work trying to use it under a LLC that owns the property. 

Try to find ways you can be useful to them.

Try being positive, it puts a smile on people's faces.I just joined the Mercedes forum too.

Unless we tried a MTR, this might bring opportunity with monthly cash flow. 

Trying to figure if the partner is the STR owner or another management company that facilitates things through you. 

Most lenders will for try to send you down other roads first such as a loan mod or short sale, before they agree to DIL. 

I am trying to cancel the contract and look for another builder to build.

Quote from @Scott MacComb: I am doing my first true house flip (have remodeled plenty of houses for rental) and am trying to figure out a contract to use with a new general contractor whom I have not worked with previously. 

You can try zillow or FB marketplace but until you are ready I would go with furnished finder and if you want use it airbnb at least for a while.

If they try to hide who their current landlord is or lie about it, you can simply deny them based on that.