And I still agree that if it brings no additional value to the property there is nothing wrong with replacing or repairing some minor things.

Recommend you get with your engineering firm and tell them what you want. 

@Barry Pittman  I have extensive knowledge of Jackson MS and up to Madison county.. these areas are very difficult for subsidized housing since so much of Jackson is already subsidized with section 8 and other state and city programs.. and since existing homes still sell for far under replacement value how do you build new.. ???

I will be moving on as soon as I settle on a suitable replacement.

One of the biggest takeaways from my Master's Program in Engineering that has made a huge impact is this: Great solutions come from great problems - you can't find the solution without first understanding the problem. 

They are using the entire rental, why not make them responsible for fixing/replacing your roof or HVAC as well?!?

Get ready to spend some serious time shopping insurance and make sure to get rental income replacement coverage in case of a loss.  

What if there are multiple units per level of the property, would only the top level units be responsible for a roof replacement?  

I agree with the previous comments about figuring out what your goals are in the next 10 years and reverse engineer - what do you need to do to achieve this? 

Long story short, they recommend a process that basically looks like...Soil scientist --> (septic engineer IF needed) --> site plan --> county approval...We've spoken to a few soil scientists and they all quote 2k-5k to analyze the property for an appropriately sized septic system.