San Francisco Ordinance of 1880

nSec. 2. It shall be unlawful for any person to erect, build, or maintain, or cause to be erected, built, or maintained, over or upon the roof of any building now erected, or which may hereafter be erected, within the limits of said city and county, any scaffolding, without first obtaining the written permission of the board of supervisors, which permit shall state fully for what purpose said scaffolding is to be erected and used, and such scaffolding shall not be used for any other purpose than that designated in such permit.