All Michigan State University facilities have a locatable address. Specific formatting instructions from the US Postal Service are available for reference.
ZIP Codes + 4
The U.S. Postal Service has asked the campus to refrain from using ZIP+4 codes since they change frequently and rather than one ZIP+4 per building, there may be many. USPS has indicated that all mail will be delivered correctly without using the 4-digit codes and it is not necessary to include it on letterhead, business cards, or envelopes. However, some units need the ZIP+4 when performing the day-to-day business operations of the university.
All university business mail must include a return address—which is also a security requirement of the USPS.