Requiring, rather than authorizing, the Montgomery County Council and the Prince George's County Council to grant exemptions from the system development charge imposed by the Washington Suburban Sanitary Commission for certain properties and projects located in Montgomery County; limiting the exemption to $80,000; altering the method by which the county councils establish eligibility for the exemptions; prohibiting the county councils from requiring that an applicant for an exemption own the property for which the exemption is sought; etc.