Cal. Rev. & Tax. Code § 23741

Notwithstanding any other provision in this part, in the case of a church exempt from taxes imposed under this part pursuant to Article 1 (commencing with Section 23701) of Chapter 4, any rental income received, directly or indirectly, from another church exempt from taxes imposed under this part pursuant to Article 1 (commencing with Section 23701) of Chapter 4 for rental of exempt function church property is exempt from any tax imposed by this part.