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Just to make sure I understand, are you saying that the spousal support was agreed to in writing, and the court approved the agreement?
Since the spousal support obligation was recognized by the court, you can obtain a judgment lien on your ex's house to enforce the support obligation. To do this, you will need to record an Abstract of Support Judgment in the recorder's office where the property is located. For assistance in drafting and recording the Abstract of Support Judgment, you can talk to a local attorney, or you might ask at the recorder's office to see if they can guide you through the process.
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Best wishes and good luck!