Moth3r said:

I'm not a huge fan of Godzilla films, but I thought the premise is always that the monster attacks real cities (originally Tokyo, Osaka, etc.)

If you're going to depict a fictional city with buildings that defy the laws of physics, you may as well have it attack Gotham City or Springfield.

See also: http://en.wikipedia.org/wiki/Suspension_of_disbelief

If we can accept the existence in a movie of a giant tyrannosaurus rex-like monster that is bullet and missile proof, awakened and powered by a nuclear bomb test and has "nuclear breath", does it really matter if the physics involving building destructing are realistic?