Whenever any street or avenue in the city shall be ordered improved by the city council by the construction, repair or removal of sidewalks or curbs, or the removal of any obstruction, along either or both sides thereof, the duties, burden or expense of constructing, maintaining, repairing or removing of such curb or sidewalk, or the removal of any obstruction, shall devolve upon and be paid for by the owner of the property directly abutting on that side of such street or avenue along which such sidewalk or curb has been ordered constructed, repaired or removed, or the obstruction removed therefrom; such a construction, repair or removal of a sidewalk or curb, or the removal of an obstruction therefrom, a written notice thereof shall be given by the director of public works to the owners or agent of the owners of the lots or parcels of land along which such sidewalks or curb may be ordered built or repaired or removed or the obstruction removed therefrom; which notice shall specify the nature of the work to be done and the time within which the same shall be commenced, that if the work is not commenced by the owner of the property within thirty (30) days after the date of service of such notice to cause such work to be done, that the owner of such property and the property itself shall be liable for the cost and assessment of the same and that if such work will be done by the city, and under its authority and supervision, and the costs thereof assessed against such property and the owner thereof. (Ord. 01-2001, 3-20-2001)