In 1906, when a devastating earthquake struck san francisco, a young real estate agent, coldwell, believed that it was time for honest professional real estate agents to provide specialized services to people to help rebuild the city. Before that, real estate agents were sold at low prices and then sold at higher prices, thus reaping enormous benefits. As a result, on 27 august 1906, coldwell established a real estate company which, in accordance with its own principles, would provide only the services of buying and selling houses and not carry out its own actual buying and selling operations, and has since begun a completely new real estate brokerage operation, which has continued to date. Over time, coldwell banker has successfully entered the field of commercial real estate brokerage, with the establishment of the advanced office in 1920 in phoenix, southern california. Then, in 1950, he entered the seattle market, and by the 1970s, coldwell banker had become a prestigious residential property brand in atlanta, chicago and washington, d. C. At the end of 2006, coldwell banker became a member of realogy, a large global real estate brand. The realogy group also has many well-known brands such as the 21st century, ear. In 2007, coldwell banker's global turnover exceeded $6. 6 billion, making it the brand of a high-capacity and single-store real estate broker。