Make sure that electric, water and gas is on before inspection and still good inspector can tell you about overall condition of the house.

I would only ever bring in a plumber/electrician if A) it was a large multi-family (a dozen or more units - which I haven't yet graduated to) or B) I knew there were potential major electrical/plumbing issues.

They have changed most of the electrical, there still is a little knob and tube left that they will probably have to fix before lender will loan us the money probably if we decide to buy this.

Electricity bill is fairly high - each unit has window AC units (some units have 2).

Downside is I am unsure if we start changing zoning how much in upgrades will be required by the city such as electrical.

Based on what we know and found out from neighbors, although we don't have any abstract evidence, Tenants were misusing the property to run a Prostitution type of business, massages service etc.

Some rentals will drag you down in ways that a tenant or buyer cannot perceive value, like plumbing electric, etc.

They need to have running water and electricity, etc...

Plumbing and electrical changes have been made where needed as well as boiler and water heater updates to accommodate the extra tenants.

Auto transfer gas&electric into the owner name might have really big bills, besides you don't have to turn gas on in summer.Same with water: if you don't bill tenants for using water - make sure that the owner agrees.