"Contractual services", for the purpose of this chapter, means services performed for the City by persons not in the employment of the City, and may include the use of equipment or the furnishings of commodities in connection with the services under express or implied contract. Contractual services shall include travel; freight; express; parcel post; postage; telephone; telegraph; utilities; rents; printing and binding; repairs, alterations and maintenance of buildings, equipment, streets and bridges, and other physical facilities of the City; and other services performed for the City by persons not in the employment of the City. (Prior Code § 7-6)