In the eviction process, the UD-101 form is necessary after a landlord files an unlawful detainer lawsuit to regain possession of a rental property, due to issues such as nonpayment of rent. This form serves as the Plaintiff's Mandatory Cover Sheet and documents supplemental allegations. It's a requirement under California's Code of Civil Procedure section 1179.01.5(c). - The UD-101 is typically completed and filed right after serving the tenant with the Unlawful Detainer Complaint (form UD-100). - This stage is reached once procedural steps like serving a Pay or Quit Notice have elapsed without resolution. - Landlords use this form to demonstrate compliance with statutory obligations and to present the current status of rental assistance or compensation matters related to the case. Moreover, the UD-101 form is essential to maintain compliance with the statutory eviction process, particularly cases involving residential property. This requirement ensures that landlords substantiate claims for nonpayment of rent and disclose any proactive efforts or pending applications for rental assistance, which could affect the proceedings. It supports transparency in the eviction process.