The one in violation of the lease were the tenants, or Cory Gardner & the United States.  But did not the parties ever envision that there might be a large group of people in an elected representative's office?  But being told that you are in violation of a lease has no legal force or effect.  In order to enforce the lease and the building's rules legally, the landlord would have to post a 3-day notice to comply or vacate.  By the end of 3 days, most-likely, there would have been compliance.