Full price on a place that needed a new roof immediately, new electrical panels immediately, possible need to re-wire the entire place and finally one of the units hadn't been updated in nearly 15 years.  

The basics:Build in 19103 BR 1 bath in each unithardwood floors are OK, need to be refinished but definitely usableasbestos siding31 exterior windowsfront and back door access into stairwell/foyerneeds full electrical upgrade (still has fuse box)needs full plumbing installedneeds full hvac systemdoing all carpentry and renovations myself aside from electrical (may end up hiring out plumbing too if the inspector will not let my Professional Engineer father-in-law certify my work)I'm reading all that I can on BP to learn about what level of quality I should use in my purchases and renovations, but is there anything you wish someone told you when YOU began fixing up an old home you were going to rent out?

The entire electrical system had also been recently (& very professionally) upgraded to 200 amp, complete with a new NG Generator.The exposed ceilings in the upper floors showed sold steel angled reinforcing of the rafters given the unusual flat roof configuration & our snow loads.

The property needed a roof, major plumbing and electrical repairs, total kitchen and bath rehab, had severe dry rot, and water damage.

It's a well kept complex but about 20 years old and has had some roof, ac and electrical problems since this couple moved in.It seems that they (the tenants) do not get along well with the Maintence man and the recent issues are starting to become bigger problems.  

(foundation, water, electrical, sewer, etc...)

With that being said I am a contractor an electrical contractor to be exact.

I asked to see the house with the electric on and they said no.

However, 10 of the vacant spaces are newly outfitted (electrical and water hookups, and septic tanks with all plumbing laied). 

I think the trick to keep people from coming into the building that don't live there.If they're invited guests, try (google results):http://www.lectralock.com/electrical-outlet-covers-commercial.html