The San Diego County Assessor/Recorder/County Clerk's East County Branch in Santee occupies a 25,000-square-foot LEED Gold, Zero Net Energy building at 10144 Mission Gorge Road that opened on February 3, 2020. The branch processes birth and death certificates, marriage licenses and records, fictitious business name filings, document recording, and assessor services — transactions that frequently involve the title and lending documentation prepared by Casa Financial Services on Cuyamaca Street. The facility houses the first County of San Diego archive, preserving permanent-retention Recorder/County Clerk records with enduring historical value in a purpose-built conservation space. An outdoor wedding venue on the grounds provides ceremony space with East County mountain-landscape views, and marriage license appointments can be booked through the county's scheduling portal. Property owners recording deeds, liens, or easements at this branch coordinate filings with East County legal counsel such as Craig P Keup Law Offices on Cuyamaca Street. The Santee branch also hosts representatives from the San Diego County Treasurer-Tax Collector's Office, consolidating property-tax payment and assessment services under one roof at the Mission Gorge Road location.