The document is a partition agreement between two parties to terminate their community ownership of a parcel of land and divide it between them. We have provided free online forms for partition actions that should only be used in conjunction with a partition attorney in California.Partition Addendum (840P) A fill-in-the-blanks RJI Partition Addendum. Uncontested Matrimonial RJI (UD-13) A fill-in-the-blanks Uncontested Matrimonial RJI. Filing a complaint for partition of real property is the best way to show your uncooperative coowner that you are serious about selling the property. A partition action enables you to force the sale of property when coowners are refusing to sell.