The owner or other person having custody and control of a landmark structure listed in section 11-1-5, appendix D of this chapter shall not allow such structure and the land upon which it is situated to fall into a state of disrepair which may result in the deterioration of any exterior appurtenance or architectural feature or other element upon which its landmark designation is based so as to produce or tend to produce a detrimental effect upon the appearance, life or character of the structure, or upon the landmark designation, or upon the character of the surrounding neighborhood. Such structure shall be maintained in good condition and repair so as to avoid a deteriorating or inadequate foundation; defective or deteriorating roofs or roof supports, chimneys and exterior walls, subject to buckling, listing, or sagging; deteriorating or ineffective waterproofing of exterior walls, roofs and foundation; and broken windows or doors or any other fault or defect which renders a structure unsafe or not protected from weathering. In addition, said premises or vacant property shall be kept clear of all weeds, fallen trees or limbs, debris, abandoned vehicles and all other refuse as specified under this Code.