It shall be unlawful for any owner of real property abutting
a City street to encroach or allow, cause or suffer an encroachment
upon a City street within a projection of said owner's property lines
to the center line of such street.
Any such encroachment upon a City street existing as of January
1, 1940, shall be deemed lawful unless a determination is made by
the proper City department or agency that such an encroachment is
hazardous to the safety, health or welfare of the public, or upon
complaint of an adjoining owner that such encroachment unduly interferes
with said adjoining owner's quiet enjoyment of his or her property.