General. Every person in charge of any historic structure, historic site, or improvement in an HPO Historic Preservation Overlay District shall maintain the same or cause or permit it to be maintained in a condition consistent with the provisions of this chapter. Insofar as they are applicable to an historic structure, historic site, or improvement in an HPO Historic Preservation Overlay District designated under this chapter, any provision of the Plumbing Code, the Minimum Housing and Property Maintenance Code, Building Code, and Heating, Ventilating and Air Conditioning Code may be varied or waived, on application, by the appropriate board having such jurisdiction over such code or ordinance or, lacking such board, by the Building Inspector, provided that such variance or waiver does not endanger public health or safety. (See Article X and Subsection C of this section on appeals and applications to the Zoning Board of Appeals regarding errors, variances, and interpretations relating to the HPO Historic Preservation Overlay District of this chapter.)