CBSA said it was following appropriate procedures outlined by the Public Health Agency of Canada.
All staff were notified and were asked to self-isolate at home while monitoring for symptoms of the virus.
Other businesses and partners operating out of the building were also notified.
While the CBSA office was shut down, it was thoroughly cleaned and sanitized.
A spokesperson says no employee fell ill from the virus while they self-quarantined.
All essential services including those related to air and marine cargo, general aviation, "long room" commercial processing, and export declarations and permits have resumed at the office.
During the closure, some services were relocated to the Pigeon River port of entry.