California Code, Streets and Highways Code - SHC § 36526

(a) At the conclusion of the public hearing to establish the area, the city council may adopt, revise, change, reduce, or modify the proposed assessment or the type or types of improvements and activities to be funded with the revenues from the assessments.

(b) At the public hearing, the city council may only make changes in, to, or from, the boundaries of the proposed parking and business improvement area that will exclude territory which will not benefit from the proposed improvements or activities.However, proposed assessments may only be revised by reducing any or all of them.

(c) The city council shall not change the boundaries of the area to include any territory that will not, in its judgment, benefit by the improvement or activity. Any addition of territory to the proposed boundaries of the area may be made only upon notice to the owners of the businesses proposed to be added to the area, as provided in Section 36523, and upon a public hearing on the addition of territory, as provided in Section 36524.