(A)   The Building Inspector shall for each inspection made, make an inspection report noting any violation of this chapter or conditions which indicate that the dwelling is unsafe.  He shall give a copy to he owner or occupant, or both, as the case may require, and shall retain one copy.  Except where a complaint is served as provided in § 151.31 at the time of the inspection, the report shall serve as a notice to the affected person that there is a violation of this chapter and may contain a time limit for compliance.
   (B)   The Building Inspector may issue and cause to be served, in the manner prescribed in § 151.33, a complaint charging that a dwelling is unfit or that a building is unsafe; if his inspection discloses a basis for so charging the complaint shall state:  that a hearing shall be held before the Building Inspector (or his designated agent) at a place therein fixed not less than ten days nor more than 30 days after the serving of the complaint; that the owners or parties in interest may file an answer to the complaint and may appear in person or otherwise to give testimony at the place and time fixed in the complaint; and that the rules of evidence prevailing in the courts of law or equity shall not be controlling in hearings before the Building Inspector.
   (C)   If after the notice and hearing, the Building Inspector determines that the dwelling or dwelling unit under consideration is unfit for human habitation, or the building is dangerous, he shall state in writing his findings of fact in support of the determination, and shall issue and cause to be served upon the owner thereof an order. To the intent and within the time specified in the order the owner shall repair, alter, or improve the dwelling or other building to render it fit and safe; or if the repair, alteration, or improvement can be made at a cost of more than 25% of the physical cost of the building not less than 50% of the value of the building, the portions to be repaired, altered, or improved shall be made to conform to the requirements of the building code for new buildings to the extent as the Building Inspector may require.
   (D)   If an existing building is damaged by fire or otherwise in excess of 50% of the then physical value before the damage is repaired, it shall be made to conform to the requirements of this chapter for new buildings.
   (E)   If the occupancy of an existing building is entirely changed the building shall be made to conform to the new occupancy.  If the occupancy of only a portion of the existing building is changed and that portion is separated from the remainder, then only these portions need to be made to conform.
   (F)   Repairs and alterations not covered by the preceding divisions of this section, restoring a building to its condition previous to damage or deterioration, or altering it in conformity with the provisions of this chapter or in a manner as will not extend or increase an existing nonconformity or hazard, may be made with the same kind of materials as those of which the building is constructed; but not more than 12 months unless the entire roof covering is made to conform with requirements of the building for new buildings.
   (G)   The assessed value for the dwelling or building for the city tax purposes shall be prima facie evidence of its value. 
('76 Code, § 210.04)
   (H)   Whenever the Building Inspector determines that a hazardous or unsanitary premises exists in the city, he shall cause a registered letter to be sent to the owner of the premises, wherein the hazardous or unsanitary conditions shall be described fully and in detail.  The owner of the premises shall be notified that he has 30 days in which to alleviate the conditions, and should he fail, the city work crew will undertake to do so at the owner's expense.  If, after 23 days the conditions are not alleviated, the Building Inspector shall send a second registered letter, setting out the above details and informing the owner that he has one week left to perform.  Should 30 days expire and the city work crew be forced to do the necessary work, the reasonable charge for the work shall be put on the owner's next tax bill, and same shall be a lien against the property until paid. 
('76 Code, § 210.07(B))