I invested 100K with them back in May with a duplex and a triplex with clear understanding that I will not invest in empty units.

I need it to work as a quadplex so moving forward, I would appreciate not getting warning posts about zoning.Should I rent it as 2 units and put people on the same lease but keep their residences separate with a door that can just stay locked or something?

I have asked my tenants to confirm their contact info and names of all people living in the house including name and age of their children. 

Once in there you will find plenty of people that are doing it, although the ones that will connect with you will most likely be begginers that don't know too much. 

In fact I know a few people who have had good experiences with Crexi.

People come from all over the country because in the midwest and specifically Cincinnati, it costs less.

Most people wont go that extra step.Oh, and by the way, don't send beautiful well designed post cards.

You are allowed to do this in the classifieds section.I understand your idea, but I don't think it would work the way you think it will.

I understand that I can deduct mortgage interest up to $750k on my personal residence.

@Travis AndresIf you do not have other assets to secure against - your best bet would be a private lender willing to take risk of essentially providing an unsecured loan.There are people out there that do this - expect very high interest rates.