Any vacant or abandoned buildings or structures determined to be unsafe pursuant to Section 110 of this code relating to structural or interior hazards must be marked by placards on the front of the structure and on the side of each entrance. Placards are 24 inches square with a red background, and white reflective border and stripes. They bear the date of their application to the building and the date of the most recent inspection.

• Plain Red: Normal structural conditions.
• Red With White Slash: Structural or interior hazards exist and interior fire-fighting or rescue should be conducted with extreme caution.
• Red With White X: Structural or interior hazards exist to a degree that consideration should be given to limit fire-fighting to exterior operations only, with entry only occurring for known life hazards.