No offense but gotta stick to SantoRayo with this one, it absolutely sucks (and yes I checked it ingame). Even for someone who started his first try on buildings, its an abomination.
-No consistency with the skin in general
-Texture wrapping all went horribly wrong
-gaps gaps gaps
-why on earth do you have another layer of the same geomesh overlapping the other?
-way too many ineffective polygons
And to Mecheon, SantoRayo is right. Not every building in wc3 has over 2k polys, but in this case those polys are not hidden after the construction phase (usually they hide the excess polys after the construction anim) so they still count over the duration of its existence, with other words: too many ineffective poly's.