From the City of Harrisburg code Section 9-107.1: Duty To Repair Sidewalks:
The owners of property abutting on any public highway of the City are required to construct, pave, curb, repave, and recurb the sidewalks in front of and along such property and to keep the same in good repair, with cement, concrete, brick, stone blocks or other permanent paving material satisfactory to the City Engineer or a designated agent as directed or approved by said City Engineer. If any owner fails to so construct or fails to repair such sidewalk or curb within 30 days after notice thereof from the City Engineer, the City Engineer or a designated agent may do the necessary work and file a statement of the costs thereof with the City Solicitor, who shall collect the same. The amount of such claim shall be a lien upon the premises from the date of the completion of work, which date shall be fixed by a certificate of the City Engineer; the City shall otherwise seek collection of the full amount, including any and all costs, plus attorneys' fees. The unpaid balance shall accumulate interest at the rate of 12% per annum or a prorated portion of the same if for any period less than one year. The City may execute against the property, its contents and other assets as needed to secure full payment of all costs owed, including interest and attorneys' fees.