The computation of the percentage allocation or split is generally done by using square footage, acreage, or some other methodology that is defensible should you be audited. 

The caveat is that every investor is different so choose a methodology that works for your business model. 

Since you have a really awesome methodology for teaching yourself, I'm curious, what do you do to "test" yourself? 

Frustration leads me to reading: 4 Hr Workweek, GTD Method, J Scotts books on flipping and estimating and FLIP and HOLD and the One Thing.What's my big hairy audacious goal for 2016? 

Using this methodology, they stand to gain from either the wholesale fee, or the commission from the sale of the property to a "Retail" buyer. 

Apparently its bulk mail with a postage discount, with no gtd. delivery date, just kinda when they can.  

But w/value add apts of any real size, appreciation takes on a whole new concept.When we are talking larger apts, commercial property valuation methodology (based on property income) not so much sales comps apply.  

The rate of increase has sped up in recent years but it's not exactly earth-shattering.Median down payment at 10 is  interesting, but sourcing and methodology are needed:http://www.prnewswire.com/news-releases/down-payme...

any recommendations on bill back methodology AND how to approach the tenants would be appreciated.  

This is because there is, in reality, no one methodology.