The UN said in its landmark global warming report that cow farts are the number one generator of greenhouse gasses (more than cars, planes, and all other forms of transportation combined).

I also wasn't too worried about the spill because I believe that appropriate cleanup efforts combined with the self correcting nature of the ocean would take care of this.

As the old school doctor would say “Take an aspirin and call me in the morning†or in the modern vernacular “take a chill pillâ€

Deflation combined with massive foreign debt.

Ultimately all the properties net together for tax purposes, one might make money, one might lose money but they all get combined to the same line on the Sch E ultimately to move to the front of the return.

If you were to do it I would use an electronic deadbolt where you can change the combination every night and check to make sure windows or doors aren't left open just in case.  

I typically use a combination of data rabbu which is free, air DNA which I have the entire country package, awning and Air review.

BUT if you are keeping the units for rentals, and have a hot water BOILER, by all means keep the radiators/baseboards that go with it, install a combi boiler (Navien or similar) that combines hot water for heating with hot water for showering.

Anyway, house hacking is beneficial because it combines multiple benefits in one.

You say 6o years old lets say mid Century- not mid century modern, probably post war, but not Craftsman or Victorian.