New studs, plumbing, electrical, and hvac.

A few plumbing leaks that we fixed, stuff like that. 

Also, check existing infrastructure including: roof, heating and air conditioning, hot water heater, flooring (sub floor), and plumbing.

Also in regards to your renovations, if you get it under contract you can then get an option period to get a contractor in there to verify your renovation estimates (at least in Texas), also if you have the time you would be shocked how much time stuff you can do yourself by watching a few YouTube videos (minus electrical and plumbing...)

The plumbing repair could be really expensive if it's original galvanized pipes.

I have my HVAC guy and plumbing company schedule directly with tenants.

The home is on a crawlspace and the other bathroom shares a wall so plumbing wouldn't be too difficult but we are wondering what type of return we would be looking at for the property value.

Yeah we have permanently housed people who are chronically homeless, veterans, victims of domestic violence, as well as other marginalized groups.

Through a series of unfortunate events, I've recently learned about a plumbing innovation that repairs and extends the life of old lateral sewer lines (from the house to the city sewer).  

The old owner was able to finish the rough electrical, rough plumbing and hang and paint the drywall.