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101A.3 Scope. The provisions of this code shall serve as the administrative, organizational and enforcement rules and regulations for the technical codes which regulate site preparation and construction, alteration, movement, enlargement, replacement, demolition, repair, use and occupancy of buildings, structures and equipment of every building or structure or any appurtenances connected or attached to such buildings or structures within this jurisdiction. Provisions in the appendices shall not apply unless specifically adopted. Wherein any provisions in this code conflict with section 108 of the California Building Code for all occupancies regulated by Housing and Community Development (HCD) that section shall govern. SECTION 102A— APPLICATION TO EXISTING BUILDINGS AND BUILDING SERVICE EQUIPMENT 102A.1 General. Buildings, structures and their building and /or property service equipment to which additions, alterations or repairs are made shall comply with all the requirements of the technical codes for new facilities, except as specifically provided in this section. 102A.2 Additions, Alterations or Repairs. Additions, alterations or repairs may be made to a building or its building and /or property service equipment without requiring the existing building or its building and /or property service equipment to comply with all the requirements of the technical codes, provided the addition, alteration or repair conforms to that required for a new building or building service equipment. Additions, alterations or repairs made to existing structures or existing equipment that are or hereafter become unsafe, insanitary or deficient because of inadequate means of egress facilities, inadequate light and ventilation dangerous to human life or the public welfare, or that involve illegal or improper occupancy or inadequate maintenance, shall be deemed an unsafe condition. Unsafe structures shall be taken down and removed or made safe, as the Building and Safety Official deems necessary and as provided for in this section. A vacant structure that is not secured against entry shall be deemed unsafe. An unsafe condition shall be deemed to have been created if an addition or alteration will cause the existing building or building service equipment to become structurally unsafe or overloaded; will not provide adequate egress in compliance with the provisions of the Building Code or will obstruct existing exits; will create a fire hazard: will reduce required fire resistance; will cause building service equipment to become overloaded or exceed their rated capacities: will create a health hazard or will otherwise create conditions dangerous to human life. A building so altered, which involves a change in use or occupancy, shall not exceed the height, number of stories and area permitted by the Building Code for new buildings. A building plus new additions shall not exceed the height, number of stories and area specified by the Building Code for new buildings. 2