Does the buyer technically own the house even though the seller might hold a mortgage on the house?

First some background...  

My work background consists mostly of the many facets of residential construction for 15+ years.

I say it to provide the proper context for this statement:  with all of that as background and having plenty of capital to deploy I find it hard to find suitable deals.  

I also have a background in construction. 

With one of them, who applied, it ended up with him asking me to prove I owned the property and going over the lease with a fine-toothed comb (after he missed a couple of deadlines to get things back to me, I moved on and denied him).I figured the facts that 1) prospective tenants see the property and can talk with the current tenants to ask about the property and me, and 2) that they have to submit an application and go through a credit and background check, and 3) that I was using Cozy to collect payments and 4) that I am available by phone, email and text whenever they want, would be enough to make people comfortable that they are not getting scammed, but it was apparently not enough for some people.Does anyone have any tips to help prospective tenants feel more comfortable dealing with you from afar and not feeling like they are getting scammed?

It can work in the background for you.  

@Alex Hugo Although technically a master lease (with or without an option) is any lease that has 1 or more subordinate leases.

You could put together an offer on contract where they technically own the house until depreciation ends and then it converts to seller finance and they hold the note.

My RE background is slim, so I've now read approximately 783,594 threads here about structuring PM deals, good practice, what to avoid, etc.