It was the real big flip project for us this year and especially important one because I had joint venture with new investor who came to know from Bigger pockets.

If you enter into joint venture with another party and get interest plus equity on your investment this would not be considered passive and will result in UBIT. 

That is best done by doing a Joint Venture on the first couple.

We require all adults (age 18 and above) to qualify to live in the unit and be named as a party to the rental agreement, jointly and severally liable. 

Joint Venture with an experienced investorMake yourself valuable ( bring something to the table other than money)Owner Financing dealsWholesale homes.I recommend reading the NO Money Down book on Bigger Pockets, ( No plugging intended ) great book for giving ideas on creative financing .

@Jason Gott Partnerships and joint ventures are tricky.

The only way I could figure out monthly payments through the website was with PayPal which neither offers ACH nor the client paying the processing fee.

(The way we went straight from a foot of snow to 90 degrees, if he doesn't have AC he might be escaping over to her place.)Start by saying that it's okay if he is living there, you just need to know about it, so she doesn't feel like you're out to get her, then talk and figure out the situation.

We have a couple of properties that required some work, but we know nothing about that part of investing, so we have a joint partnership with other investors who ARE qualified to do that work, we both benefit from the transaction. 

I don’t know about your proposed strategies, but if she is no longer married she won’t be filing jointly, so her exemption is $250k.