He seemed like a big-time agent who works with a lot of long-term investors.

Stay disciplined with your numbers, build relationships with local investors and agents, and be patient, good deals will come with persistence and the right approach.Good luck!

Talk to a top commercial agent for more insight...

However if I was an agent, broker, GC, etc I do not feel that it would be my responsibility to verify the underwriting.  

Hey Joe, I'm an investor as well as a real estate agent in Green Bay.

Your time is best spent producing the revenue that allows you to invest in the first place.That includes using local agents you meet and feel are a good fit for you, property managers, possibly buying completed properties like the one you posted here, and outsourcing as much of the process as you can as you get started. 

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I would give the listing agent a call.

My current agent suggested if it made sense financially, to do some rehab work to get the properties rent-ready, but I do not have the liquid funds to do so and sell these as-is.

Or real estate agents.