Proxie Models has new terrain for your table with their plastic building flats.
From their website:
More home made plastic items for the kit bashing hobbyist. This item is a building flat to help you create a factory or office building. Also finished the range of bases available to include DBA and various sci-fi round bases. Priced low and available now in the store now. I also posted a how to video on plastic injection molding for the home hobbyist.