Here is the range of cooperating commissions on DFW duplexes listings active as of last week.

What is the mindset or strategy when the offers are out of range from the absolute top ranges of rent that could be charged?

Thank you @Brandon Croucier I appreciate you being able to give me a general idea and the range of the rates these days. 

Interest rates are in the 6-7% range... so it doesn't take a rocket scientist to figure out if you are increasing your loan amount by ~$50k, and at a higher interest rate,  your payment has to go up or your terms have to extend.  

Yes you could sell and get your 500k less taxes and then reinvest but maybe looking forward you need to look at investments with higher returns of 10% range.  

With baseball, you start making money once you reach the big leagues, in the minor leagues, every player's salary ranges from 34k to 39k.

My developer buyer just said he could buy land elsewhere for a better deal if I didn't want to sell.In my evaluations, I could buy land for $20k, for example, but there were lots of lots in the $20-40K range.

RoofstockRoofstock allows you to browse a wide range of rental properties for free, providing a valuable resource for finding turnkey investments.

You can likely fetch rents in the $1,000 to $1,200 range, so cash flow—even on a significantly levered deal—is highly achievable.

Be in your future mind and realize how important it is to identify the range of specialist that you will need for the life of those assets.