Century 21 First Canadian London Office at 420 York Street has been the #1 office in units sold since 2004 for Century 21 Can ... ada* and the #1 office in London Ontario regardless of Brand name on the London and St. Thomas Association of Realtors**. With over 235 Realtors on our staff we sell a wide variety of Real Estate Property including Residential, Investment, Income, Commercial and Farm property in the London and surrounding area. We are here for you! read more