They're only required to repay you for health, safety, preservation of the property....fixing broken windows, roof leaks, locks, etc.#3. 

But accompanying a more measured tone was also the noticeable maturation of thought around the still developing SFR and BFR asset classes.

A measurable portion of his returns (plus or minus!) 

Review your state's landlord tenant laws and enforce any measure regarding non-payment of rent.

Manager said when they replace unit they replace flue because shape on new ones is different and/or Dept of Bldg and Safety require it.  

This will always result in conflict and uncertainty, because were measuring apples too hand-grenades. 

Maybe let her know it's a fire hazard or safety concern or that if you get inspection from the fire department you could be looking at a huge fine. 

What key performance indicators (KPIs) do you track to measure their progress?

Keep your personal safety and that of your tenants and neighbors in mind. 

Many things go wrong in construction, some of which are unavoidable, how the contractor handles those issues is paramount and speaks volumes to their abilities (or lack there of in the cases above).There are no short cuts to construction or dealing with the building and safety/planning departments in cities, they are slower than turtles in almost all cases.