Section 28-502.6.2. Unlawful for outdoor advertising company to sell space on illegal sign

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It shall be unlawful for an outdoor advertising company to  sell, lease, market, manage or otherwise make available  to  others  for
  advertising  purposes space on a sign that has been erected, maintained,
  attached, affixed, painted on or in any other manner  represented  on  a
  building  or  premises  in  violation  of  any  provision  of the zoning
  resolution, this code, the 1968 building code or rules adopted  pursuant
  thereto or to enter into any agreement for such purpose.

                    
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