A partition action enables you to force the sale of property when coowners are refusing to sell. This is a document through which the parties agree that particular property will be "separate property" and will not be divided.A marital property partition is an agreement between spouses that allows them to convert community property into the separate property of one spouse. Solving Joint Ownership Problems in San Bernardino. Super Lawyers Rated Partition Attorneys in San Bernardino. Ending Co-Ownership Disputes in San Bernardino County. A joint owner or a claimant of real property or an interest in real property may bring an action to partition the property or interest in a district court. How do I obtain a partition for a san bernardino property held in tenancy in common? My sister and I would like to sell,