Wander on over to the HO train section of your local hobby shop. A quick flip through a Walters HO railroad catalog will give you more building ideas than you ever thought possible. They carry products from lots of manufacturers and have US as well as Euro prototype buildings.
They have a website, too, but they have so many products that thumbing through the catalog is way faster--no waiting for pages to download/update.
Thanks for the suggestion. For far, I've got a few DPM buildings to be assembled, as well as some woodland scenics buildings, some cardboard ones, and a couple of IHC buildings. I am just starting to build a few of the kits now. Here's some of my works in progress:
Nice line of stuff. I've spent hours 'thumbing' through the online Walters catalog. Its incredible. So much stuff, so little time... TY for the listing on the "Pure Water" building. Have to look that company up. Model Power right?
Building 5 is the Society Hill town house with the decorative masonry from roof level installed lower down. The fraternity house version is the same model in different coloured plastic - there's a kit in the model shop a few blocks away.