To initiate a partition action in California, a co-owner must file a lawsuit in the appropriate court and name all other co-owners as defendants. A Partition Action is a type of lawsuit a coowner would bring against another one or two owners if they cannot agree on how to dispose of the property.A partition action is a lawsuit that forces the sale or division of jointly owned real property. A partition action is a legal process in which a joint owner of real property forces the division of the property to sell it. In this blog, we will cover the court's determination of the market value of the property and the exercise of the cotenants' buyout rights. Codified in the California Code of Civil Procedure under C.C.P. 872.210, a partition action does not create a new title in real property. A partition action is a courtordered equitable division of property. The first step in the partition process is preparing and filing a complaint for partition in the county where the property is located. A partition action in California is a legal remedy available to co-owners of real estate who wish to divide or sell the property. Partition is common when co-owners cannot agree on what to do with the property.