California Code, Government Code - GOV § 59290

If pursuant to the notice, the bondholders file with the legislative body one or more written proposals for the surrender and cancellation or redemption of not less than 75 percent of the principal amount of all the original bonds referred to in the resolution of intention, the legislative body shall direct the engineer to make a diagram of the property within the new district, affected or benefited by the proposed acquisition and cancellation of such original bonds and to be assessed to pay the cost of the proceedings.