The District of Columbia UCC1AP Financing Statement Additional Party is a legal document that is used to record the details of additional parties who are involved in a financing transaction in the District of Columbia. The document includes the full name and address of the additional party, as well as the name and address of the secured party. It also records the date of filing and the filing number assigned by the District of Columbia UCC Office. The types of additional parties that can be included in the document are guarantors, surety, lien holders, and assignees.