521.21 DUTY TO KEEP TREE LAWNS, SIDEWALKS AND ADJACENT PUBLIC PROPERTY MAINTAINED.
   (a)   Every owner, occupant or person having charge of any tenement, building, lot or land fronting upon any avenue, street, alley or public highway of the Municipality shall keep the entire width of the tree lawn, sidewalk, or public property from the street line or curb to the lot line free and clear of all structures, vehicles, earth, sand, brick, stone, ice, snow, rubbish, dead trees and dead branches of trees, or other material which from any cause whatever shall have accumulated or may accumulate upon the tree lawn, sidewalk, or public property between the street line or curb line and the lot line above the established grade of the same, and free of all weeds, grass and vegetable growths that are more than four inches in height.
   (b)   Whoever violates this section is guilty of a misdemeanor of the third degree.