Any City of Portland official or employee acting on behalf of a Participating Bureau who authorizes or appropriates expenditures for an Improvement Project shall include in the capital improvement program of the City’s capital budget, and disburse to the Regional Arts & Culture Council, a monetary contribution for Public Art equal to  Two percent (2%) of the  total Eligible Costs or two percent of the total Eligible Funds of the Improvement Project, whichever is less.  The Office of Management and Finance and the Portland Development Commission shall each adopt administrative rules to implement this section, which to the greatest extent practicable shall set forth the same procedures to be followed by all Participating Bureaus, including the Portland Development Commission.