Westcor was a subsidiary of The Macerich Company and a large developer of shopping malls in the Southwestern region of the United States. It was founded in 1964 by entrepreneurs Rusty Lyon & Bob Teske. It was acquired by Macerich for $1.5 billion, after which it continued to operate as a separate, wholly owned division.[1] In 2012, Westcor was consolidated into Macerich who has continued to operate most of their properties.