Saskatoon Square is a 16 story office tower in downtown Saskatooon Saskatchewan. It is located at the northeast corner of 22nd Street East and 4th Avenue North. It was built in 1979 and is the third tallest building in Saskatoon and the tallest office tower.In December 2010 the building was sold to Dundee Real Estate Investment Trust for $50 million. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building