[CoolNard]

Wouldn't your reasoning be inductive? Indeed, nothing was specified prior to the question of deleting any existence, exclusive of the humans. However, the alternative shouldn't be neglected, that is the death note not stating "a building whose name was written in the note *would* die". XD Therefore, due to its inexplicitness, when the death note is notoriously known for being otherwise, it should have included some form of indication of what and whom it can kill. The fact that it did not, proves greater the odds against the theory of its ability to take lives aptly alien to the note's guidelines.

Moreover, neither Light nor L nor Near nor Mello (in random order) are what you, or for that matter anyone, would call senseless. Considering their highly advanced intellect, at least one of them would have highlighted and utilized it for his gains by now.

In addition, a building has no life, scientifically speaking. While it may be true non-living entities sometimes develop lives of their own when sharing an intimate attachment to their owners if they're caring and loving enough, the prospect of fostering a bond like so just isn't realistic...

But that's a realist's point of view. For all we know, what may seem alive may not and vice-versa ~_~

I'm gonna havta checkmate your reason out then! Wahahahaha X_X *evil*

Edit: Well, Kanji's post made more sense than mine