Whenever a structure within 10 feet of a street line is to be
erected or raised to exceed 40 feet in height, or whenever such structure
more than 25 feet in height is to be demolished, unless the street
is officially closed during the construction or demolition, the owner
or the person doing such work or causing such work to be done shall
erect and maintain during such work, adjacent to the street lines,
sheds of sufficient strength and stability to sustain safely the weight
of materials that may be placed thereon and to withstand the shocks
incident to the handling of such materials or their preparation for
use and accidental jars from trucks delivering material.
When the roofs of such sheds are used for the storage of material
or for the performance of work of any kind, substantial railings not
less than three feet high and solid toe boards not less than six inches
high shall be placed along the open sides and ends of such roofs.
No such shed or walkway shall be constructed until a permit so to do shall have been issued in accordance with the provisions of §
148-6 of this chapter. Applications for such permits must be accompanied by detailed plans or sketches of the proposed shed or walkway. Permits issued under this article shall be of no longer than 30 days' duration, unless extended.