Providing that a Maryland corporation or a real estate investment trust has the power to renounce specified business opportunities in its charter or declaration of trust or by a specified resolution; repealing specified provisions of law relating to dividends payable in shares of one class of a corporation's stock to holders of shares of another class of the corporation's stock; altering the circumstances under which a corporation registered as an open-end company may redeem shares of its stock from any stockholder; etc.