So the confusion I think you’re hitting is file size vs object dimensions. A big, huge building that just has a few windows tends to take less resources to draw than a detailed coffee cup. It all depends on the Level of Detail (LoD). So “How many polygons is this thing” is more important than “How big is this thing.” So things inside the building should only load in when necessary, but typically the outside walls can all be one piece. So with that in mind- the more complicated (size) something is, the longer it takes and more resource intensive it is. But the dimensions (measurable in length/width/height) have very little to do with it. 
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