A partition action enables you to force the sale of property when coowners are refusing to sell. The UPHPA and Partition of Real Property Act may overtly favor partition in kind, that remedy is simply not available for most Californians.This is a document through which the parties agree that particular property will be "separate property" and will not be divided. A California partition action happens when one co-owner of real property wants to sell but other co-owners do not want to sell their ownership rights. A partition lawsuit can be pretty difficult to stop, though it is not impossible with help from an experienced property dispute lawyer.