So, in the real world, it is very hard to make that happen with a 15% down DSCR loan even though it technically exists.  

➡️ What type of existing flat roof material is in place?

And in their contract, this clause is in effect for 180 days after the renter exists the lease but then buys the property.

They are the product that you are offering to potential customers and to existing customers.

In a Wrap you ARE creating a new mortgage that “Wraps” around ( includes) the existing mortgage.

Unfortunately, I don't believe such a calculator exists. 

It can provide a centralized entity for ownership, making it easier to add new properties to the LLC's portfolio.Credit and Financing: Having properties owned by an LLC may impact your ability to obtain financing or refinance existing mortgages.

You could get a heloc on your existing home to use as a tool to potentially use to buy the lot of provide down payment $.

You could argue that they are more "stressed" than a lot of the typical sellers of existing inventory are out there. 

If you refi to a renovation loan by including the ADU costs + paying off the existing mortgage, would your total monthly payment be financially comfortable and agreeable to you?