Cal. Government Code § 53317.3

If property not otherwise exempt from a special tax levied pursuant to this chapter is acquired by a public entity through a negotiated transaction, or by gift or devise, the special tax shall, notwithstanding Section 53340, continue to be levied on the property acquired and shall be enforceable against the public entity that acquired the property. However, even if the resolution of formation that authorized creation of the district did not specify conditions under which the obligation to pay a special tax may be prepaid and permanently satisfied, the legislative body of the local agency that created the district may specify conditions under which the public agency that acquires the property may prepay and satisfy the obligation to pay the tax. The conditions may be specified only if the local agency that created the district finds and determines that the prepayment arrangement will fully protect the interests of the owners of the district’s bonds.