The Commissioner of Administrative Services shall have the supervision, care and control of the State Office Building, the state police buildings located in the city of Hartford, any state-owned building designated by the Governor, except as otherwise provided by law, and the premises held under lease or rental by the state, except as otherwise provided by law, but shall make no permanent material change in the structure or ornamentation of said buildings affecting their symmetry or architecture unless authorized by an act of the General Assembly. All premises of property leased or rented by the state or by any officer, department, institution, board, commission or council of the state government and located outside the city of Hartford shall be under the control and management of the administrative head of the department or agency using or occupying such leased or rented premises, except as otherwise provided in subsection (b) of section 4a-2.