You could sue your partner in small claims court for any amounts owed to you. However, assuming you obtain a judgement, this could all happen again. What you may want to consider is something a bit more drastic (and expensive) but effectvie. It's called a "partition".This is a legal remedy available to co-owners of property when they cannot agree as to ownership matters (such as in your case); it allows for division of the property. Accordingly, if a property can be physically divided the court will so instruct; if division would be impracticable (e.g. in the instance of a single family house) a court would order a sale in lieu of partition and an equitable division of the proceeds among the co-owners. Before doing so however, the court would permit one co-owner to purchase the interest of the remaining co-owner at fair market value.You do not indicate much about the property is in question. At this point you should consult with a local real estate attorney.