LTR tenants are required to have the home professionally cleaned. 

Now my main issue is I need a fire detection system in a enclosed back porch that leads up to all three floors, but I don't know what's the minimum I would need to be compliant or that the fire marshall is suggesting what he wants or recommends.

You mean the water was so heavy that it cracked the floor joists and the entire floor and basement ceiling fell in?

This included modernizing the kitchen with high-end appliances, upgrading bathrooms with spa-like features, and adding hardwood floors for a luxury feel Lessons learned?

I'm considering new floors, fixtures, countertops, windows, removing popcorn ceilings, etcetera.

For example, to get up-to-date property tax data you would need to scrape every county's tax data website (thousands of different websites, data formats, issues, etc...) then aggregate and clean the data.

There would potentially be some weight issues with the 2nd+ floors of some shopping malls, depending on what the potential tenant wants to store in the upstairs unit. 

I would consider getting out of property management and getting into cleaning IF you think they are doing better than you . 

We had to pay a biohazard company over $9k for a thorough clean up.

New paint, lvp floors throughout, new bathroom.