In 1924 Rosebank was identified as a test site for a new telephone exchange that was established here. The small building was substantially enlarged in the 1930s when the exchange was extended to cover the north and western areas of the City. Later it housed the Saxonwold Post Office. The building was unoccupied between 1995 and 2005 and was then converted into a boutique hotel, retaining the original facade, which is reminiscent of the 18th Century Cape Townhouse architecture. The building currently houses the Monarch Hotel and is a brief stroll from the Rosebank Gautrain Station.