When the inspection turned up knob and tube I wanted to make sure this was taken care of given this is a rental and the electric was not up to code.

Hey @Redgy Saint-Germain , The very first article of the Realtor Code of Ethics states that agents are to a "pledge themselves to protect and promote the interest of their client" (you).

If you don't see ANY signs out, its a good sign that your city is actively picking them up and enforcing the code. 

I would build a list of distress property owners Code violations city liens vacant property registration and such.

Are you saying I approach the appropriate town office as if I were a contractor hired to remedy any code violations the property may have?

City code enforcement had already started gunning  for these properties and now all I can afford to do cut the grass and clean up the exterior.

It's a lockbox so one would need to know the code to open it to get the key.

Specifically: Property condition - properties in poor physical condition, that have code violations, or structural/pest issues are viewed poorly by lenders.

VPM requires the tenants to front the costs to rehabilitate the property, pay all the overdue taxes, and resolve any outstanding building code violations associated with the property, Wisconsin’s complaint states.And, if the tenant does not remedy those issues within a short period of time, VPM evicts the tenant and “repeats the cycle by renting the uninhabitable property to yet another Wisconsin consumer,” the Wisconsin DOJ said in a statement.According to the complaint, VPM rented properties with sewage in the basement; black mold; lack of water, heat, or electricity; insect infestation; and multiple code violations; among other issues."

There may be codes liens.