Brookfield Office Properties is making big ripples in the commercial real estate market. Formerly Brookfield Properties, the company owns stakes in about 100 commercial properties around the world. It primarily invests in properties in large cities including Boston, Houston, Los Angeles, Calgary, Toronto, and Washington, DC. The company's portfolio totals some 78 million sq. ft., including most of Manhattan's World Financial Center; It also has a handful of properties in the development pipeline. In 2012 Brookfield announced its first major purchase in London, a portfolio of four operating properties, a development site, and adjacent smaller buildings in the city's financial district for some $830 million.