Utility Installation means carpeting, window coverings, air lines, power panels, electrical distribution systems, lighting fixtures, space heaters, air conditioning, plumbing, and fencing. Lessor may require that Lessee remove any or all of said alterations, improvements, additions or Utility Installations at the expiration of the term, and restore the Premises to their prior condition. Lessor may require Lessee to provide Lessor, at Lessee's sole cost and expense, a lien and completion bond in an amount equal to one and one-half times the estimated cost of such improvements, to insure Lessor against any liability for mechanic's and materialmen's liens and to insure completion of the work. Should Lessee make any alterations, improvements, additions or Utility Installations without the prior approval of Lessor, Lessor may require that Lessee remove any or all of the same.