Travel for business development/sales $10K/yr.Would love your 2 cents on how I should assign the expenses (e.g. which companies should pay them) as they all benefit each business and assigning expenses to certain businesses would affect partner Kevin differently?

https://www.amazon.com/Paper-Profits-Beginners-essentials-mortgage-ebook/dp/B06Y4C7X6Y/ https://www.pprnoteco.com/wp-content/uploads/2016/08/Intro_to_Note_Investing.pdf Finally, check out NoteMogul which has a very reasonably priced intro course to note investing: https://ecourse.notemogul.com/training?

I'm essentially doing this now and have an in-law suite that I AirBnB for greater than a normal rent in my neighborhood.You should analyze the property and see what your PITI would be with 3.5% down and what you can realistically get for rent in the other unit(s).  

Right now, I would characterize myself in the accumulation phase, as I am essentially stock piling cash to be able to put down the down payment and have plenty left over to account for any unforeseen expenses (repairs, vacancy, etc.).My question is, where should I be keeping this cash?

Sorry to hear about this bad situation.In your shoes I would do nothing that in any way benefited myself. 

The assignment contract can be a simple one page document.I've heard of wholesalers who don't want to show the actual purchase contract to the end buyer, but don't let them not show it to you because when you sign the assignment contract and agree to take over his position as the buyer and purchase the house, you're essentially agreeing to whatever he agreed to in the purchase contract. 

They are off-market and can really benefit from not having to fix things up before putting on the market.

The benefit was condition of properties was not as stringent and you can sell them separately.  

The benefit is having lower living expenses and having someone else help pay down the mortgage.You need to do the analysis as if you are no longer living there.  

They are essentially locked in place.