The annex and plaza area was the site of a Woolworth's store until 1979, when it was converted into a park that is also used as an outdoor cafe in good weather. The walls on the street sides of the plaza are constructed from Cushwa brick. The plaza features a free moving sculpture entitled "Quartet," designed by Angela Conner of London.

A waterfall stands in a corner of the plaza. Water to the waterfall and the sculpture is supplied by an aquifer that flows underneath Pittsburgh. This same aquifer, a remnant of the Wisconsin Glacier, also supplies water to the famous fountain at Pittsburgh's Point State Park, the H.J Heinz Company, and to several downtown buildings.

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