To develop and maintain specific design guidelines based on historic preservation resources including, but not limited to, the Old Town Development Plan and Guidelines and development plan guidelines for each Historic District and the Secretary of the Interior's Standards for Treatment of Historic Properties for the alteration, construction or off-site relocation of designated Landmarks, Historic Districts and Historic District Contributing Resources. Said guidelines may be amended, modified or revised based upon recommendations from the Planning and Zoning Commission following a report of any such change by the LHDC. Following reasonable notice, a public hearing shall then be held before the City Council on said proposed amendment, modification or revisions and the City Council shall determine whether to amend, modify or revise the guidelines pursuant to an ordinance and the guidelines, including color charts and review standards, shall be available to the public in the office of the Building Commissioner and in the office of the City Clerk. Copies or pertinent sections of the guidelines and review standards shall be printed for distribution to residents and businesses whenever an application for a permit is received and to developers, contractors, purchasers as soon as the City has knowledge of the proposed development or construction;