@Sharon Hsu  Your property manager should have some solutions for you. 

We both agree to have a very clearly defined partnership agreement so that if anything comes up down the road we have a solution agreed to ahead of time. 

I was not comfortable with this solution.

That would be the standard solution.

If it was my project, I would try to focus on getting people into a few finished units ASAP just to cut down the bleeding of 16 empty units.The 1/3" plywood is probably a good suggestion and is probably the correct way to solve the problem.Fixall and a belt sander will probably also do the trick to solve the problem for a little cheaper but a bit more labor.Alternatively, some carpet with thick pad for now could also be a reasonable solution.

In fact, under Texas case law, an agent has a duty to keep their principal informed because the principal is required to monitor agents. 

Our possible solution is to change our use of the lot to a SFR (the front unit we live in) and then permit the rear unit as an attached ADU.

@Adam Anderson I'm thinking about solutions.

I've been monitoring for months and there's really not much out there that's better by the numbers without going into bad areas where there's all the costs associated with having lower rents and lower quality tenants.

What is your alternative solution?