He got greedy and got burned, does not mean it's not a great tool.

It will be a lot cheaper to install, though it is the most expensive way to heat a home, short of burning $100 bills in the fireplace.I have electric baseboard in the home I just purchased, so to mitigate the costs, we purchased (not leased) solar panels. 

It sounds like a challenging commercial property that will burn a lot of cash.

But like you said there are so many unknowns  and the risk  of burning through 5K for things unseen is highly likely.I think 20k is a decent buffer for the unknowns and the possibility of the sale not napping ad quickly ad o would have hoped for. 

Frankly if someone had threatened me personally I would have called police, I would have sat in my car until officer came and took report, I had tenant threaten he'd burn the place down..

Every time we renewed our lease it really burned my posterior so I read the book straight through and got in touch with Ben via email.

So familiarize yourself with the different ways payment can be processed, because many landlords were burned...https://www.biggerpockets.com/forums/52/topics/500...

Some people just posted stuff for the Superbowl then forgot about the listings.Read some posts from @Al Williamson he is helping a lot of people get their airbnb's going and currently pushing a 30 day minimum model as a way to get a premium over long term unfurnished but not burn out from too much turnover

Just don't want to get burned. 

-Oil burning furnace: Fire hazard with amount of buildup in furnace and in flue.