Cal. Pub. Util. Code § 27473

If the district shall file its objections in the manner aforesaid to the annexation to a special transit service district of such territory or portion thereof, the territory, or portion thereof, shall not be annexed to the special transit service district except in the manner provided in Article 6 (commencing with Section 27461) of this chapter. The district may withdraw such objections by filing with the city clerk a certified copy of a resolution of the board stating that such objections are withdrawn. Thereupon such territory, or portion thereof, shall be deemed incorporated into and annexed to the special transit service district as provided in Section 27472.