Start with your property management agreement to see if this is addressed. If not, you will have to demand that the money be returned within a certain time and, if not, you will have to file an action for conversion or breach of contract in small claims.
I agree with the above attorney, however you might need to file in a different court depending on the amount of money he owes. The clerk of court should be able to instruct you on the appropriate limits for small claims, district, and superior courts.
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