Novus Design Studio has several new sci-fi buildings available over in their webshop.
From the release:
28mm Battle Damaged Sci-Fi Buildings Now Available!
New 28mm models are now available for retail and wholesale purchase on our website. I would like to thank all the gamers who took the time to post their product suggestions and comments on what they would like to see in this new group of models. I found gamers’ product suggestions to be very helpful and I incorporated as many of those ideas as possible into the designs themselves.
Retail price range is $10.00-$42.00 plus shipping.