Question is do you want to lose a tenant over this and suffer a possible eviction process and a unit refresh or can you find another solution?

We haven't found any solution to that problem.

They promised a turnkey solution with active, professional, experienced project management and an entire permitting department at our disposal.

Hey @Andy Yu - echoing what @Eric Hajdu brought up, your best solution for a quick fix is likely going to be to offer a buyout money or cash for keys. 

We mustn't lump everything under one solution/issue. 

Which ones would be an all in one solution?

While an appreciation play makes perfect sense to some (ie. if you see the price of your newly purchased house increase by 3.3% a year, in 3 years you will have gained 10% equity - which would be $20,000 on a $200,000 house), you have to be in a position to sustain that purchase.  

At that point, it's worth researching and finding a solution that better meets your needs.

This stabilization will help ease financing conditions for buyers, contributing to sustained demand for housing.

If he violates it one more time, kick him out.If you wait until a problem presents itself and then try to find a solution, you will struggle.