I am paying thousands of dollars for these vacant buildings for water, gas, electricity, oil, insurance, taxes, sanitation etc.

No structural changes, plumbing, electrical, etc foreseen, just cosmetic updates at this point. 2 main questions.- Is there anything wrong with continuing as it has been for the foreseeable future? 

The best part is I borrowed it from another electrical contractor who uses it for his six-figure and up jobs.

And RV parks often won’t allow them unless they can meet appropriate length, width and electrical and plumbing requirements, which can add thousands of dollars to the home’s cost.""

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.