Temporary storage of construction equipment and materials for projects within the City; provided, that: (a) fencing or landscaping may be installed, in consultation with the Community and Economic Development Director, to at least partially screen the equipment and materials from public view; and (b) such storage shall be for a period of no more than 18 months for any single off-site construction project, except that a six-month extension may be granted if the use has been determined by the Community and Economic Development Director to not interfere with other immediate public needs for the site.