The item was reported at 10:45 AM.
Police blocked traffic in the area and sealed off the building.
Workers in Moon Suits entered the mailroom and administered a field analysis test to the substance on the envelope. The technicians determined the substance was not hazardous.
Officials declined to identify the substance, but assured reporters there was no danger.
Emergency workers withdrew, and the building was reopened at 12:45.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.