Other Fires in Steel-Structure Buildings
WTC1, WTC2 and WTC7 are the only steel-structure buildings ever to have collapsed (allegedly) as a result of fire. There are several cases of fires in other such buildings, none of which collapsed.
In May 1988 a fire at the Interstate Bank Building in Los Angeles destroyed four floors and damaged a fifth floor of the modern 62-story building. The fire burned for four hours. The building did not collapse.