It is the responsibility of the abutting property owner to repair, replace or reconstruct, or cause to be repaired, replaced or reconstructed, any damaged, defective or broken sidewalks and to maintain in a safe and hazard-free condition all sidewalks outside the lot and property lines and inside the curb lines or traveled portion of the public street. If a sidewalk is deemed by the city to be unsafe and posing a public hazard, the city shall provide written notification to the abutting property owner that repair or efforts to repair the damage or condition to the sidewalk must be completed within 60 days of the date of notification. Failure or refusal by the abutting property owner, upon due notification by the city, to take corrective action will be cause for civil action.