Unfortunately, the scope of this question is beyond what is reasonable to discuss in a Trulia question.
The correct answer to your question is: it depends on what was agreed to in your current contract for deed. The only real way for myself or another agent on Trulia to answer would be to have you post all of the intimate details of your contract online for the world to read.
My best advice would be to take the contract to a local attorney who specializes in C4D's (or at least has done a couple in the last couple of months) and have him/her review it for you. It may cost a few bucks, but what you are proposing could have far reaching financial consequences so it makes sense to have a pro review it for you.
Coldwell Banker Burnet
licensed MN Broker