Cal. Sts. & High. Code § 5898.31

Since contractual assessments on real property under this chapter are voluntary and imposed pursuant to an agreement with an assessed property owner, the Legislature finds and declares that voluntary contractual assessments under this chapter are not assessments for the purposes of Articles XIIIC and XIIID of the California Constitution and therefore the provisions of Articles XIIIC and XIIID and Article 4.6 (commencing with Section 53750) of Chapter 4 of Part 1 of Division 2 of Title 5 of the Government Code are not applicable to voluntary contractual assessments levied pursuant to this chapter.