The City Council may establish as a part of the resolution authorizing the acceptance and processing of a Specific Plan, a fee or fees to be applied to a Specific Plan area in order to reimburse the City for the costs of preparation, processing or implementation of the Specific Plan. If a Specific Plan is initiated and prepared by the City, actual costs of said Plan shall be assessed based on relative benefits to the affected property owners. Notwithstanding the foregoing, no fee shall be established by the City in violation of the Contributor Agreements entered into by the City in 1991 as part of the City Council's Resolution No. 91-61.