It's a once in a lifetime installation. ie, by the time a metal roof needs replacing, you won't be on earth to worry about it.

Vinyl plank flooring is affordable, easy to install, and resistant to moisture and wear, making it ideal for high traffic areas like stairs.

I am thinking things such as:-Sewer & water lines to public or the installation of a well / septic system.

I had an emergency water heater issue, here how they treated  me1) They have few plumbing companies they deal with who have horrible reviews and you have to go with them and wait for atleast a week before they can approve you.2) Once their tech diagnoses it,  Now AHS says installation is not covered and they want to order a water heater themselves which would take many days.

The MIL suite was a 1 bed / 1 bath and had recessed lighting installed throughout.

A few years back I know a few hotel owners that had to install elevators.

The truth is that likely you should NOT install a rooftop deck if the calculations weren't done to support that type of load. 

It can also display a custom message.I stopped using it when I installed You Tubetv as I don't want them logged out of all the cable channels.

The fix the issue and installed a cleanout which was not thereBut- Was a big surprise They told me - the sewer pipes connect to a septic tank not to main sewer line without permit.

Also NEVER mention even in passing something you would like to do to the property like “I really would like to install new windows or repaint the exterior of the house,” etc. because the tenants will pester you about it until you do.