Looking at 40 unit in Texas

[DG H.]

I'm looking at 40 units that's split into 4 buildings. I'm doing the do diligence now. HVAC is older (80's), some of the units have been "spruced up" as a tenant moves. There are 6 empty units, all units are 2/1.5. About half of the units are tired looking and needs a little TLC. All of the units are in good areas. The PM is the owner.  What would you look for the most other than HVAC, plumbing, roof. Many of the leases are MTM now and some residents have been there 2-5 years. Asking 900K. Any pertinent clauses to write into the contract if this works out? How long do you usually add for inspection?

Thank you for the answers.