Or have a separate contract as Wesley W stated.What was the outcome of this situation?

Luckily these two individuals, separate states and realtor companies, had everything working and running smoothly including my title and exchange company.

I told them I was looking for trust because a series of LLCs while keeping assets separate do not meet the needs I'm looking for. 

I normally recommend people keep those separate.

Cost segregation work can often be separate though. 

You aren't required to provide ADA compliant units, so you have two separate possible design accommodations.

As far as the practicality, you want to look for homes with somewhat separate spaces, and theres an app now called padsplit that I've not used but have heard good things about to help with the management nuance of it.  

That said, I do have significant personal assets I don't want to put at risk so I have one LLC for my two rental properties and keep all accounting separate.  

An IRA is a separate legal entity, different from you. 

The furniture in the unit is ours, so we are responsible for that.We do get a separate lessee insurance policy on the furniture and such that we've placed in the condo, and we require our sub-lessees to get a policy as well.