Definitely reach out to some local lenders and see what kind of products they’re offering that are not on the shelf.

@Matthew PorcaroNot familiar with this product.

The linear line is the productivity.

I want to be productive with my time.

You devote energy to it and position your product (you) to be the best possible value proposition around. 

Now you determine what cash-on-cash you want and what loan product fits that goal.

I've thought of starting with them despite the additional work to get the Executor on board, because I hear it can be quite a productive list. 

I don't know how banks are about doing that sort of thing nowadays, but in other times it's been common to have an initial mortgage at a certain rate, and get a 2nd mortgage that is completely separate, but is a long term loan as well.

Vacancy will depend on the product you are providing, the market demand for that product in the specific area your property is located, the market, how you price your units etc...For example I own one duplex since 1993 that has a vacancy rate of less than 1% and I own a 9 unit bldg since 2008 that is 10%

Nowadays, it's common practice to record the Assignment as soon as you get it.If you find the last Assignment of Mortgage in the assignment chain, you will find the current owner of the loan.