External Changes definition
External Changes. The Tenant agrees that it shall not erect, affix or otherwise attach to any roof, exterior walls or surfaces of the Building any antennae, sign, fixture or attachment of any kind, nor shall it make any opening in or alteration to the roof, walls, or structure of the Leased Premises, or install in the Lepsed Premises or Building free standing air-conditioning units, without the prior written consent of the Landlord which may be arbitrarily withheld.