A California Writ of Possession of Real Property is a legal document that allows a landlord to take control of a rental property or real estate when a tenant has failed to pay rent or has violated the terms of the lease agreement. This writ is issued by a court and is served to the tenant before the property can be physically taken away from the tenant. Once the writ has been served, the tenant must vacate the property or face eviction. There are two types of California Writ of Possession of Real Property: Unlawful Detained and Summary Possession. An Unlawful Detained Writ is used when a tenant has failed to pay rent or has violated the lease agreement and has been given proper notice to vacate the premises. A Summary Possession Writ is used when a tenant has failed to pay rent or has violated the lease agreement and has not been given proper notice to vacate the premises.