Institute RUBS or other claw-back provisions if the electric bill has become a debilitating expense. 

Send mailers to Water, Gas, and electric company shut off lists 65.

Get a home warranty for anything major that might go wrong, plumbing, heating, electrical.

Also the electric box needs to be rewired (quote on that was $1500). 

The property was built in 1931The condition sounds really good, new windows, electrical panels and other renovations, but there are some things that need to be done estimated at $50k and it sounds like that is mostly deferred maintenance.All the units are occupied except for one 2 bedroom and it sounds like it is time for some rent adjustments.

Currently, I have 3 deals going:1) A gut job remodel turning a 1500 SF 3/1 farmhouse into a 3/2 rental with either a carport or garage. 2) A house hacking (my family's current residence) remodel of a 1700 SF ranch style 3/2 into an open floor plan. 3) A mobile home (currently shopping for a deal) rental on an empty lot with a septic tank and electricity already available. 

I am a licensed and insured electrical contractor here in NY.

None that I know of.2) How would I know the extra electricity cost for this freezer?

If I had the storage, I'd be stocking up on appliances; mainly washers/dryers, electric ranges. 

Same is with the remodeling - I estimate that more than 25% of our rehab cost typically is spent on things inside the walls - new water lines, new sewer pipes, new electrical, sometimes corrections in messed up ductwork.