CA SB63

Establishes the Public Transit Revenue Measure District covering Alameda, Contra Costa, San Mateo, and Santa Clara counties plus San Francisco, governed by the Metropolitan Transportation Commission's board

Authorizes a 14-year retail transactions and use tax of 0.5% in the four counties and 1% in San Francisco, subject to voter approval at the November 3, 2026 statewide general election

Allocates tax revenues to BART, Muni, Caltrain, AC Transit, and smaller transit operators for operations expenses, with specific percentages varying by county (e.g., BART receives 64.70% of Alameda County revenues, 29.14% of San Francisco revenues)

Requires a two-phase financial efficiency review of AC Transit, BART, Caltrain, and Muni by a third-party consultant, with transit operators required to adopt implementation plans for cost-saving measures as a condition of receiving funds

Creates an ad hoc adjudication committee process allowing county transportation entities to petition regarding inconsistent service standards, with authority to withhold up to 7% of a transit operator's funding for noncompliance