Cool model, i would expend on the description, are you including the interior as well? if not then indicate that, also you should show wireframe images.
Why does the model have so many Polygons and Vertices? It can probably be created with 100,000-200,000 so it would be tough to get this imported into a video game, which im assuming because of the size of model is why your file sizes are also 156mb and up. See if you can decrease those numbers without losing quality, i cant tell you where you can decrease because you dont have wireframe images posted.
Rotate your buildings wood texture 90 degress so its horizontal not vertical, same with the stairs.
the design itself is pretty cool .