Lots of material online.  

I think you are answering your own question here - if you can't find reviews or much info online then....

While these contractors are certainly out there, in my experience they also tend to be the ones that work with home owners directly and charge "retail" prices, not "investor" prices.I would shop around with lenders to understand how they work with their loans.  

I'm a business owner with investments in retail, media, and addiction treatment facilities.

Pro: In addition to MLS access your brokerage might provide access to other resources such as detailed online assessment data not available free to the public. 

If you're going to a bank, you'll want to look for a smaller, community bank that has a history of lending on retail centers and multi-family...what they call "CRE" lending vs the owner-occupied "C&I" lending.

The address was submitted to their red book and now shows up online as official address when I try to ship items from Amazon or similar websites.

Years ago it was a thriving commercial retail area, but has since fallen into disrepair. 

I keep reading different things online.

Understanding my customer, I bought similar properties to what they were currently renting.This strategy is similar to how national retail chains operate: identify your target customers and provide what they want.