The Library Department shall have the power and duty to:
(a) establish, manage, control, and operate a central library and branch libraries within the City, and to acquire and take by purchase, lease, condemnation, gift, in trust, or otherwise, and to hold for the City, any and all property necessary or convenient for those purposes; and
(b) design, construct, alter, and maintain all buildings, structures and grounds devoted to purposes of the department, from any funds under its control and available for those purposes, notwithstanding other provisions of the Charter.