Maybe its a touch heretical, but I'm beginning to hate buildings. Far too often they're just large cubes or rectangles that take up space and offer nothing interesting, other than movement complications and fussiness should anyone decide to use the interior. One thing I've begun considering lately is facades that you simply cannot go inside. Of course, this potentially has the problem stated above where you just end up with a chunk of impassable terrain that eats up table space. However, if you can go inside them, the scaling just always seems...off, and the interiors are often just lazy and unappealing (we have a lot of mdf terrain starting to show up which feels just sort of flat and boring imo).
Lately with buildings I've begun thinking a little differently than I had before when my focus was on making it so you can enter them (without dedicating much of the table to a large and interesting interior). What about doing facades but putting the emphasis and focus on making the outside interesting, appealing, and useful. Have multiple ways to get up on the roof, use shapes that aren't simply big squares and add interesting angles of cover. Create breezeways, rooftop signs for cover, balconies with ladders, and other little bits of personality.
Basically my thinking is, more focus on making the exterior appealing and useful, less focus on bothering with the inside and the scaling nightmare that seems to occur in there. Part of this might just be my bias after multiple experiences with rules lawyers always managing to make buildings you can enter miserable.