For the purpose of this chapter, an immediately dangerous building or structure shall be defined as any building or structure which has been so damaged by fire, infestation, seismic disturbance, or by any other cause to the extent that its structural integrity is irreparably damaged or destroyed and is in imminent danger of collapsing or where the condition of the structure poses an immediate and present threat to life, health or safety of the public. (Prior code § 50.03.303)