(

a) If a petition signed by percent or more of the registered voters residing in the district, or by the owners of percent or more of the land within the district not exempt from the special tax, is filed with the legislative body requesting that proceedings be commenced to change the types of public facilities or services financed by the district or that the rate or method of apportionment of an existing special tax be changed, or that territory to be removed from the district, or that a new special tax be levied, the legislative body shall within days of the payment of the fee determined under subdivision (

b) adopt a resolution of consideration in the form specified in

Section to make those changes within the community facilities district except that an existing special tax being used to pay off any debt incurred under this

chapter shall not be reduced or terminated if doing so would interfere with the timely retirement of that debt. (

b) Upon receipt of any petition filed by landowners under this section, the legislative body shall, within days, determine the amount of a fee sufficient to compensate the local agency for all costs incurred in conducting proceedings to change the district pursuant to this article. Upon receipt of any petition filed by registered voters under this section, the legislative body may determine the amount of a fee, within days, sufficient to compensate the local agency for all costs incurred in conducting proceedings to change the district pursuant to this article.