Buildings that are old and/or abandoned pose what level of risk compared with new structures?

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Older and abandoned buildings pose a greater risk than new structures because their structural integrity and safety features have often degraded over time. Deterioration from rot, rust, corrosion, and insect damage weakens beams, columns, and connections. Without regular maintenance, load paths become unreliable and the chance of sudden collapse increases as a fire weakens already compromised members. Hidden spaces, voids, and concealed fire areas allow fires to spread unseen and can lead to unexpected and rapid structural failure. Abandoned sites frequently have unsafe renovations, accumulated debris, and potential hazardous materials that amplify fire intensity and complicate suppression. With no occupants or ongoing upkeep, egress and access conditions are more precarious, further increasing the overall danger. All of these factors combine to make old or abandoned buildings riskier for fire and collapse than newer structures.