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. 

Built into televisions, laptops, Alexa, Google and Apple devices, not to mention a slew of "spy" cameras designed to look like ordinary household items (water bottles, phone chargers, clocks, smoke detectors, shower heads, and even teddy bears).

The water heater had a little corrosion, which I saw (and frankly means it needs to be replaced) and he said one previous inspector noticed a little condensation in the electric panel.

Also got to go and deal with an air conditioning issue at my other property, Shop vacuuming up water and cleaning up a basement floor!

Water management is another huge issue - wells, septics, sump pumps - didn't really know anything about these, but have gotten an expensive crash course!