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Home Discover Get Connected About Us More Downtown Santa Rosa Click on the photo to view a brief video on the Historical Ilfeld Warehouse which now houses GCDCSanta Rosa Mainstreet. Click the link to view the Ilfeld Warehouse Project Plan. Describe your image Click on the photo to view a brief video on the Historical Ilfeld Warehouse which now houses GCDCSanta Rosa Mainstreet. The Santa Rosa MainStreet is an independent nonprofit local program to facilitate a shared vision for our downtown encourage economic vitality and celebrate Santa Rosas cultural and historic assets.