Essentially what I understand, and might need clarification on, is you the buyer and the seller enter into a joint venture that has an exit plan for the seller.

Developing a renovation budget is an essential step in adding value to multifamily properties.

Because know that their ability to advise you essentially goes away for the most part.

(essentially following Frank Vasquez). 

Essentially, I am wondering if it is a good idea to purchase a house here for investment purpose. 

What I'm getting at here is in my previous market essentially anything in a C+ area with a 10% cap rate on a 20% down mortgage would be a sure fire sale.

Is a project manager essential/required on a rehab.

I essentially want to be able to marry the data easily from Buildium to quickly so I get a full financial view of my business.

In my over half century investing in real estate I have never really found a book or singular resource that "ties together the essentials - investing principles, lending strategies, dal analysis, syndications and PM best practices" as you ask.  

The beneficiary would be your family, I.e a child or whoever the trust is essentially for at the end of day, and the trustee yourself.