You should engage the services of a Trusts & Estates attorney who can bring an action to enforce the terms of the trust. Simply taking the step of bringing the lawyer in may result in a settlement.
You will likely have to commence a proceeding to force the sale. Alternatively, depending on the terms of the divorce judgment, and the trust, you may also be able to do so within the confines of the existing divorce action that resulted in the divorce judgment. You may also be entitled to legal fees, depending on the terms of the documents.
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