Cal. Sts. & High. Code § 11702

If in connection with the establishment of a pedestrian mall and concurrently with the proceedings taken pursuant to this part, the legislative body proposes to improve the proposed pedestrian mall and for that purpose uses the Improvement Act of 1911, the Municipal Improvement Act of 1913, or any similar special assessment law, the legislative body may combine any part of the proceedings taken pursuant to this part with any part of the proceedings taken under any such special assessment law, to the end that duplication of ordinances, resolutions, notices, hearings and other acts or proceedings may be avoided.