It's totally about 9/11, although like most songs, it incorporates and touches on other events that also fit into the metaphor. Chris said himself "My take on 9/11, for what it's worth." The WTC was not on "Maitland Street", so it's either a fictional location, or a street he came upon (I imagine in Oz, I live in NY, so) and liked the name enough to use it.
It's totally about 9/11, although like most songs, it incorporates and touches on other events that also fit into the metaphor. Chris said himself "My take on 9/11, for what it's worth." The WTC was not on "Maitland Street", so it's either a fictional location, or a street he came upon (I imagine in Oz, I live in NY, so) and liked the name enough to use it.