The work was routine maintenance performed by the crew, which has been working its way down several Broad Street blocks in recent weeks, removing a few trees and shaping up others, Traffic Engineer Steve Cassell said.
In the median of the 600 block of Broad Street, the 6,654-square-foot brick chamber building is one of several city-owned properties available for auction.
Sealed bids for the properties will be opened next week.
Built in 1978, the chamber building was designed by Chinese-born architect I.M. Pei. The building has been empty since the chamber moved to a Greene Street office building in 2010.