I was told to wrap any outlet in a metal box (especially a two wire) with electrical tape.Those two prong receptacles are half the cost of a box of 10 three prong, so they can add up quickly too.

Usually if the units we constructed legally from the start there will be independent metering for each unit, a separate gas, water, and electric meter and there should be two addresses, one for each unit.

The garage is metered (electrically) separate from the house.  

One of us is a broker/contractor, I'm a general contractor/agent, my son is an agent/architectural designer, our son in law is a licensed electrical contractor. 

Infrastructure such as curb, gutter, sidewalk, electric, gas, putting in roads, and getting everything to the point of beginning construction? 

You also have water and electricity expenses.

Buy newer (late 1970s-early 1990s) with larger foot prints and fewer issues with infrastructure like electrical and plumping.

Unfortunately, the electricity and plumbing is off. 

Major- roof, electrical, plumbing, structure, etc.

Also I don't see any electric/gas costs, just water and maintenance.