Advertising signs, when the same advertise only services, articles or products which are offered within the building; provided such signs are attached to the building and do not extend above the outside walls of the building or are detached freestanding signs not located on the public right-of-way, in utility easements or within five (5) feet horizontally from overhead primary power lines and shall be pole mounted and elevated not less than six (6) feet. Any sign encroaching upon the public right-of-way shall comply with the International Building Code, as amended, and approved by the City of Monett. No detached billboards shall be allowed in District "C." "Billboard" is defined, for purposes of this Section, as a sign that draws attention to or communicates information about business, service, commodity, accommodation, attraction or other activity that is conducted, sold or offered at a location other than the premises on which the sign is located.