I'm beginning early investigation of a potential 8-unit multifamily on Milwaukee's Southside and curious what people can tell me about prevailing/ average cap rates in the nearby area which I could use to set offer price. 

I'll keep on investigating. 

Basically, if an investigation took place at a property, can I request the findings of that investigation from them?

I would open a fraud investigation with their legal department, they may have another name for it but it signals that their team that handles mismanaged or fradulent payments would need to get involved. 

Then investigate brokers you think will support that goal and go from there.  

If this already sounds like too much work to investigate these issues and pay for good advice, then I’d say managing property for someone else may not be for you.

Doing something new and exciting may be worth investigating too.   

Maybe send the police to investigate, if they will...

Have fun investigating. 

Either way you will naturally start building reserves for its replacement, but if it is a flat roof, you may want to investigate the feasibility and cost of building a hip roof over it when the time comes to replace it.Again, congratulations.