The letter says the Indiana Finance Authority, Isolux Corsan, and I-69 Development Partners are negotiating to come up with a "Memorandum of Understanding."
The section of interstate from Bloomington to Martinsville won't be complete until at least October 2017.
The Bloomington company halted work on the project earlier this month because the private developer owed Crider and Crider more than $2.3 million.
Some I-69 sub-contractors walked off the job this week because they haven't been getting paid for their work.
INDOT says rain has prevented crews from fixing erosion issues along I-69.
Indy's Family Restaurant is one of 96 that could have to move because of I-69 section six.
INDOT will announce the remaining routes for I-69 later today in Martinsville.
Troopers recently arrested three people on drug charges during a traffic stop after uncovering 25 pounds of marijuana, cash and a loaded firearm in the car.
A ceremony is reportedly planned for Dec. 9 to mark the opening of the new section of interstate.
The I-69 private developer held an open house to allow public comments and answer questions about Section 5 of I-69.