There shall be in the Public Works Department a Board known as the Public Improvement Commission, consisting of the Commissioner of the Public Works Department, the Commissioner of the Disabilities Commission, the Commissioner of the Property Management Department, the Commissioner of the Transportation Department, the Commissioner of Inspectional Services Department, and the Executive Director of the Boston Water and Sewer Commission, ex officiis. The Public Improvement Commission shall not be subject to the supervision or control of the Commissioner of Public Works except as he or she acts as a member of said Commission; but unless otherwise ordered by the Mayor, the Public Improvement Commission shall not communicate with the Mayor, or make any annual or other report, except through the Commissioner of the Public Works Department. The Public Improvement Commission shall have all powers and perform all duties conferred or imposed by statute on the Board of Street Commissioners except (a) those conferred or imposed on the Committee on Licenses in the Public Safety Commission by subsection 14-2.1, (b) those conferred or imposed on the Commissioner of Public Works by subsection 11-6.1 and (c) those conferred or imposed on the Real Property Board by subsection 11-7.1.