If the district constructs any rail transit lines, such lines, and the rolling stock and other facilities therefor, shall be coordinated with the system of the San Francisco Bay Area Rapid Transit District.

If the district constructs any tunnel within the Geary Corridor in the City and County of San Francisco, such tunnel and its underground stations shall be constructed so that the conversion of such facilities to physically accommodate the equipment used by the San Francisco Bay Area Rapid Transit District can be accomplished at a minimum cost.