Also, obtain a civil engineering firm that specializes in local land development. 

We had an electrician, plumber, structural engineer, general inspector and a couple of concrete leveling companies look at the house and they missed tons of stuff.  

However, as we were discussing the project in more detail, he mentioned that the price did not include engineering and pouring of the slab, connecting to city sewer/water, or the framing.

I could be wrong but I doubt a turnkey company will fix this using a structural engineer.

My property manager was also considering engineered or real wood as well, but it seems the durability isn't very good in those types of flooring.

They are hard engineered wood floors.

I have been involved in property rental for about 30 years and have been a software engineer for nearly 20 years. 

The more Likes you receive, the higher you'll appear on search engine results and the more likely you'll be able to convince sponsors to give you money to mention their name and services.My takeaway from these observations is it helps if you have a flair for self-promotion, which is something I lack.

Our background:wife is in medical field and I’m an engineer.

I am also an engineer and I have worked on and overhauled in the individual components more than a few times myself.