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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. Additions or alterations shall not be made to an existing building or structure when the existing building or structure is not in full compliance with the provisions of the Building Code except when the addition or alteration will result in the existing building or structure being no more hazardous based on life safety, fire safety and sanitation, than before such additions or alterations are undertaken. EXCEPTION: Alterations of existing structural elements, or additions of new structural elements which are initiated for the purpose of increasing the lateral-force resisting strength or stiffness of an existing structure need not be designed for forces conforming to these regulations provided that an engineering analysis is submitted to show that: 1. The capacity of existing structural elements required to resist forces is not reduced, and 2. The lateral loading to required existing structural elements is not increased beyond their capacity, and 3. New structural elements are detailed and connected to the existing structural elements as required by these regulations, and 4. New or relocated nonstructural elements are detailed and connected to existing or new structural elements as required by these regulations, and 5. An unsafe condition as defined above is not created. Alterations or repairs to an existing building or structure which are nonstructural and do not adversely affect a structural member or a part of the building or structure having required fire resistance may be made with the same materials of which the building or structure is constructed, subject to approval by the Building and Safety Official. Installation or replacement of glass shall be as required for new installations. Minor additions, alterations and repairs to existing building service equipment installations may be made in accordance with the technical code in effect at the time the original installation was made, subject to approval of the Building and Safety Official, and provided such additions, alterations and repairs will not cause the existing building service equipment to become unsafe, insanitary or overloaded. Existing installations. Building service equipment lawfully in existence at the time of the adoption of the technical codes may have their use, maintenance or repair continued if the use, maintenance or repair is in accordance with the original design and a hazard to life, health or property has not been created by such building service equipment. Existing occupancy. The legal occupancy of any structure existing on the date of adoption of this code shall be permitted to continue without change, except as is specifically covered in this code, the California Building Code, the California Existing Building Code or the California Fire Code, or as is deemed necessary by the Building and Safety Official for the general safety and welfare of the occupants and the public. A change in the use or occupancy of any existing building or structure shall comply with the provisions of Section 20.04.410 of this code and the California Existing Building Code. Installation of smoke alarms. No residential property may be sold or traded in the City of Pleasanton unless and until the seller installs or provides for the installation of smoke alarms in accordance with Section 907 of the California Building Code or Section R314 of