I was thinking there should be a forum for kits of buildings. Or maybe just a Misc. forum for kits that don't really fit into any existing category?

Yeah, but usually that falls under the armor section with thier dioramas.
Are you talking about doing just buildings with no cars, planes, figures or armor?

I would think that buildings fall within Armorama's Dioramas discussion group, since it's got the sub-group of "Buildings & Ruins". As for Misc, I guess that's what "Modeling in General" is for.

Right, just buildings themselves. There are kits of things like Japanese castles and the Eiffel Tower. Possibly in scales to give a nice convenient size model and not constrained to be in a scale for use with figures or cars.

i have seen a model kit of a football stadium,
you have the huge castles from that eastern european company,
and probably to think a hell of a lot more, but is the traffic as high as armorama and aeroscale?