The council ordered the mediation in the hopes that Coker and his opponents could develop a compromise plan for the Wade Avenue and Oberlin Road development.
The neighborhood group said Wednesday that Coker is not listening to their considerations and declared the talks at an impasse.
Residents say the Coker team did not give proper consideration to: street connections,open space, walking space and over all size of the project.
They say the volume of traffic in the area would increase by 12,000 cars per day, far more than they are willing to accept.
Coker has not commented on the talks.
The council gave the two sides until August 7 to reach a compromise.
It is unclear what will happen to the project if the two sides do not come to terms by then.
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