Real Estate Agency. Colleen Gray has been working with buyers, sellers, and property management for over 15 years, providing her with the expertise to help with all of her clients’ real estate needs, whether she is working with Toronto waterfront condominiums or Riverdale and Leslieville homes. Colleen believes that it is important to never stop learning, and in 2008 she became a member of the small group of real estate agents to obtain an ASA (Accredited Senior’s Agent) designation.