As an alum, you can speak to the guard in the 624 Michigan Avenue building, show your state photo I.D. or driver's license, and explain your reason for needing to use the Library.  The guard will contact staff at the first floor service desk in the Library who can authorize your entry and assist you once in the Library.

Contact us with further questions: https://ask.colum.edu/ask 

If you'd like more information about resources for alumni, you may be interested in this guide: https://libguides.colum.edu/graduatingseniors