Before visiting local Colorado tax offices you should consult with a Tax Attorney
The Colorado Dep't of Revenue has an office within the Motor Vehicle building on Union Blvd. but they don't keep regular hours. They have limited authority but they can help to process your case.
8830 N Union Blvd
Colorado Springs, CO 80920
Hours: Vary, usually between 10:00am-2:00pm M-F
1375 Sherman St.
Denver, CO 80261
Tax Information: (303) 238-7378
Collections: (303) 205-8291
Discovery: (303) 205-8292
Field Audit: (303) 355-0400
No Free Parking