Cooper's Prospective Property 1

In Season 2 episode 19, Agent Cooper begins his search for a house in Twin Peaks. A real estate agent shows him several properties. This one, the first he sees, is actually the Snoqualmie Train Depot. The building is now part of the Northwest Railway Museum located in downtown Snoqualmie.
1989

2008

My hunch is that these "real estate" shots were taken in Snoqualmie/North Bend as reference pictures during location scouting for the pilot, then used in episode 19, to great effect, as real estate listings. Here's another of these photos, clearly taken in Washington State, which Agent Cooper looks at just before he tosses the coin that lands on the photo of Dead Dog Farm (shot in California).
Second (Washington) Listing

Dead Dog Farm Listing