To your success!
They are an excellent source for these types of properties. They do not have a website.
These are the only property types they deal with-not only in Seattle, but in and out of the US.
Please feel free to contact me if you are interested in finding out more.
Although certain commercial regions in the country do not use the service. Your area tends to prefer the very costly and proprietary Costar.com For sale listings on the service are free, although the rest of info costs a pretty penny.
Never forget the local MLS. I find diamonds in the rough there on occasion.