Building a cabin in a tourist destination that does not have easy access to gas or electric.So I will need to run electric line anyway and considering installing underground propane tank, is it worth it?

Island. nothing installed in your island. 

I also tried to install it today and couldn't find it in the app store.

If so, were permits pulled & were they installed by a professional5.Are any of the homes rented to students6.Is there a flat roof7.are there asbestos shingles8.

A reasonableness standard is applied to negligence claims and I would argue a property owner who owns real estate in the Poconos and knows the property is left vacant due to the owners decision to lease the property as a short term rental should know that the pipes are more inclined to freeze and therefore should install heat tracing lines or other measure to ensure the plumbing lines do not freeze.

And it doesn’t end in closing the deal; it's the beginning of an extraordinary transformation to come with a full renovation and redesign!

Perhaps an installment sale will also achieve what you want if you can keep their income below a rate thrshold. if they are sensitive to capital gains, then think through options where you can get it stepped up. 

The return of installing one is not 1 to 1 but will increase your properties value. 

Selling at FMV avoids the gift tax but provides your child with a higher tax basis, reducing their future capital gains liability.A better strategy for selling below FMV is to sell the house at FMV on an installment note, then forgive interest and principal annually up to the gift tax exclusion amount.

People tend to waste a lot when everythings included, so this helps to avoid that problem.There are also companies out there that can install a meter in lieu of doing a full submeter to ascertain how much usage the unit is using monthly.