PDX dwg
here’s a link to a dwg file I made from some Portland GIS maps.
https://drive.google.com/file/d/0Bz83HR508qOONnJfbWpwR2x4aDA/view?usp=sharing
this has the street curbs, building footprints, 5 ft contours, and the rail lines–maybe a good place to start for site models.