Determination of structures as unsafe; abatement required.

All buildings or structures which are structurally unsafe, unsanitary or not provided with adequate egress or which constitute a fire hazard or are otherwise dangerous to human life or which, in relation to an existing use, constitute a hazard to safety or health by reason of inadequate maintenance, dilapidation, obsolescence or abandonment are, severally, for the purpose of this section, unsafe buildings. All such unsafe buildings are hereby declared to be illegal and shall be abated by repair and rehabilitation in accordance with the procedure of this chapter.