The owners of lots or portions of lots fronting any public street or place shall have the duty of constructing or causing the construction of curbs and gutters in front of their properties upon notice to do so by the director of public works:
A. Pursuant to section 12.04.010 of this title, or
B. When that street or place has been improved by the construction of curbs and gutters for a total frontage of more than fifty percent on one side of such street or place in any block; or
C. Where a petition signed by the owners of more than sixty percent of the front footage of any part of an unimproved portion or portions of a block has been filed with the city clerk requesting the installation of such improvements in front of said part; or
D. Whenever the city council of the city upon its own motion orders the installation of such improvements in front of said part.
(Ord. 645, 1995; Ord. 521 § 1(part), 1987).