Cal. Civ. Code § 8-2-205

With reference to existing buildings, authorized enforcement authorities should give special attention to the conditions or defects described in this Code section in accordance with the provisions of Code Section 8-2-204, so as to assure any such conditions or defects are identified and corrected as deemed appropriate by the enforcement authority having jurisdiction based on applicable state and local codes and through the utilization of appropriate compliance alternatives:
(1) Structural. Any building or structure or portion thereof which is in imminent danger of collapse because of but not limited to the following factors:
(A) Dilapidation, deterioration, or decay;
(B) Faulty structural design or construction;
(C) The removal, movement, or instability of any portion of the ground necessary for the purpose of supporting such building; or
(D) The deterioration, decay, or inadequacy of the foundation;
(2) Number of exits. Less than two approved independent, remote, and properly protected exit ways serving every story of a building, except where a single exit way is permitted by the applicable state or local fire or building code or life safety code;
(3) Capacity of exits. Any required door, aisle, passageway, stairway, or other required means of egress which is not of sufficient capacity to provide for the population of the portions of the building served and which is not so arranged as to provide safe and adequate means of egress to a place of safety; and
(4) Mechanical systems. Utilities and mechanical systems not in conformance with the codes in effect at the time of construction of a building which create a serious threat of fire or threaten the safety of the occupants of the building.