Lastly more to my point - I thought you worked for a MF syndication in the past that I was not sure but wanted to mention and that you are not just someone coming off the street having never been involved in a deal (unlike a lot of others).  

The client can distribute proceeds through a private agreement without involving the title.

For example, you might agree to a 70/30 or 60/40 split, depending on his level of involvement.

Sounded like there was heavy paperwork involved.  

Companies that know what they're doing don't get involved with the race to the bottom. 

Risk entails everything from lawsuits to lack of diversity in investments to low rates of return to high exposure to vacancy (more units theoretically lowers vacancy exposure).

My humble advice to anyone attempting to do creative finance is:Creative finance is for experienced investors who have access to capital if anything goes wrong.Learn the lawsDon't use a contract "off the internet", laws vary by state and are also regulated on a federal levelLearn the financing techniques correctlyDon’t skip parts of the processDon’t ever do a “kitchen table” closingUse the proper deedAn attorney can help you with the legal work, but the rest you are on your ownYour guru will not bail you out“Investing” in someone else’s deal by providing a small 2nd loan so the “investor” can pay for “cash to the seller” and for “closing costs” so he can do the deal is a very bad planKnow what problems can ariseLearn the responses and solutions to problems before they are neededKnow everything there is to know about Title and what that meansKnow who a "protected class" individual isLearn the "back doors"Learn human natureUnderstand timelinesUnderstand regulation enforcement (some of these "mistakes" have a 10 year statue of limitations ( they can charge you 10 years AFTER you do the transaction) and carry hefty fines and possible imprisonmentThe court doesn't accept "I didn't know" for an answer"Know that the source of the lead plays a serious role in some states and federallyKnow how much of a "profit" pushes the boundaries to invite an investigationYou can be sued by the seller if you don’t do things correctlyYou are automatically at fault if an investigator or attorney or regulator gets involved.

I think if you are going to keep all three parties involved as owners of the deal long term then you need to separate yourself as a renter and a contractor.

In the Bigger Pockets free book, "Real Estate Rewind", as one of the 11 co-authors I wrote about one such Tax Sale purchase and made money but not enough money to warrant the risk involved.

Leverage magnifies return. 3) The effort involved in adding an ADU is comparable or larger than a rehab associated with a BRRRR.