Is there aluminum wiring?

Since it was built in 1945, your electrical is aluminum wiring-assuming it was never updated.

Beyond that, we do usually install decent/durable blinds (otherwise your tenants will end up putting bedsheets, aluminum foil, and all kinds of other creative solutions in your windows, and/or damage things while trying to install and uninstall their own) and window screens.

Hi, I have around 40 acres of property in Southeastern Kentucky and I want to start a trailer park.

I say that because if the PM only does handy-man work . . . perhaps he or she is not equipped to know if the the plumbing p-trap was installed properly, if the breaker at the electrical panel is large enough for the AC, if the aluminum wiring has purple wire nuts, if the outlet is GFCI protected, if the wall is not structurally built, etc.

Has the electric been upgraded to meet today's standards or is in aluminum wiring, too small of a panel, weak breakers, knob-and-tube wiring, no GFCI outlets, etc?

And get them aluminum wrapped if possible.

You will need to change out the plumbing due to the materials @JD Martin stated and other stuff for instance the aluminum wiring and upgrade the electrical panel most likely. 

Most of the original aluminum windows are having issues operating and they are all single pane.

SCOPE OF WORKAdd a carport with a back porchNew roofNew a/cReplace window glass and paint aluminum framesPaint brick Remove ornamental brick walls in front off house.