I’ve had this tenant that I already plan on not renewing with, but my city called today needing access to the building (4 unit) to turn off water.

This includes gas, electric, water, sewer, trash etc.

I would ask the owner for the age of the roof, age of utilities (water heater, boiler/oil tank), and ask if/when the most recent upgrades were made to the property.Of course, take the responses with a grain of salt.

Warm climate tile throughout or LVPCold climate carpet in bedrooms maybe wood or lvp in hall and lvp or tile in kitchens and baths In between its a toss up It also depend of course on price of house 

Oil tank removal and remediation should be the seller's responsibility, not yours, UNLESS you're a very experienced investor getting a tremendous deal sold strictly "as is" where you've waived all your inspection rights.The worst case could be significant soil contamination requiring thousands of dollars in remediation, followed by soil and ground water tests by the state of NJ.

Not sure if watering helps or hurts, but your tenants are not going to water.Is everything separately metered?   

I then but a Tiny Home on it and set up my PV system and water catchment and lived there off the grid for 4 years.

The things that draw power are water heaters, and appliance.

My company does mold remediation and we find that there is so much moisture in bedroom walls we can almost squeeze the drywall with our hands and get the moisture to drip like squeezing the water out of a washcloth.

Some things you can negotiate such as you wanted to put in a new water heater on the day they have a birthday party planned.