Just to be clear, because you are admitted to CU Boulder, your courses would be at CU Boulder. You could also ask if you are eligible to take graduate classes at CU Denver, I do not know if thats possible. CU Denver has a commuter campus in Denver near Denver Metropolitan State and Denver Community College. Anschutz is the dental, medical, and public health college in Aurora. Sometimes they are both called “CU Denver” as Aurora is right next to Denver.