Also located there was the old city centre campus. Many of these buildings were sold over the years to Robert Gordon's College for school use, while others have been sold for redevelopment. In July 2014, the St. Andrew Street building (which had been replaced by the Sir Ian Wood building at the Garthdee campus) was sold to the Canadian hotel Sandman Hotels group to be converted to a four-star hotel. The 12,000 square metre building was constructed around 1908 and had served as the Aberdeen College of Education until purchased in 1968; the University claimed it to be the third-largest granite building in Europe, after the Spanish Escorial palace near Madrid, and Marischal College. The university plans to retain the historic Administration Building for the foreseeable future.