The Exchange Chambers were built for Oamaru merchant George Sumpter in 1876. Designed in a simplified Italianate style by architect Thomas Forrester, the two-storey building is a significant element in the outstanding Victorian streetscape for which the Harbour/Tyne Street Historic Area
The Whitestone Civic Trust took over the building in 1989. The exterior of Sumpter's Exchange was restored in 2001 and the first floor office space and staircase were reinstated. In 2013, the former Exchange Chambers is home to Tiger Lily’s and the Oamaru Textile Emporium.