Beware of basement oil tanks!
I have an STR in New England that had a basement oil tank. This winter it developed a leak. Fortunately, a guest was there who alerted me to the problem in a timely fashion. Even with that, remediation has cost me over $50,000. And it is NOT covered by my insurance. They claim it was due to corrosion. And I had an annual furnace inspection 1 week prior to the leak! I have subsequently learned that for a minimal fee, you can add a rider to your insurance policy to protect yourself, should a leak occur. Hopefully, this info will help prevent this frustrating situation for folks in the future.