Sylvia Jonathan's association as one of Coldwell Banker Platinum Properties' independent brokers is a successful synergy of professional skill and recognized national prestige. The firm is located in central Orange County in the heart of Irvine and is individually owned and operated. Coldwell Banker Platinum Properties offers the advantages of a large brokerage network throughout the nation. While less adaptive real estate brokerages are closing their businesses, we are here to stay.