Notwithstanding the provisions of section eleven, article six, chapter five of this code, the commission shall properly maintain, repair, manage, operate and control the state legislative building; promulgate bylaws, rules and regulations, in accordance with the provisions of chapter twenty-nine-a, for the use and operation of the building; and may make and enter into all contracts or agreements necessary and incidental for the performance of its duties and the execution of its powers under this article, unless or until another agency, board or commission is designated by law to perform such duties and assume such responsibilities.