NNN absolute STNL depending on tenant,location,etc. usually dictates selling cap rate.Generally gas stations, pharmacy, banks pay the most money if it is a corner site.Other option is  a 2 to 3 top strip such as Aspen Dental, T-mobile, and a Starbucks in one spot.Overland Park generally has a low end area and then on the other side a high end demographic  over 100k income on the other side.

Ask other tax practitioners what they would recommend and charge relating to the same strategy.

As as been pointed out, it's a niche area that most CPAs/tax practitioners don't specialize in.

He has put off new AC ducts and his dental work.

Have a couple dental practices need to get sold before we can move home but want to start investing now

In Cheyenne we get a lot of long stay guests in the form of  physical therapy and dental students doing practicals for a couple months, people in town for the legislative sessions, retired hockey team parents and military transfers arriving before their family's. 

Usually smaller firms or solo practitioners are much cheaper, but tend to have less specialty knowledge than law firms big enough to have specialists. 

When I told him I was looking to buy some rental property I asked him if I should set up a separate entity or if I should just buy it with the company that owns my dental building and equipment.  

We both work as nurse practitioners, so at least for now this will be something we do on the side.

Some general practitioners do real estate transactions, but they will not likely understand your specific needs.