Seattle-based real estate site Redfin said Thursday that it has expanded into five new markets, including Charlotte, Raleigh-Durham, Houston, the Bronx and Delaware. The company said that the new expansion brings its reach to 10 million new people. Redfin provides an online, technology-enabled real estate brokerage. The new markets bring the company to 21 major markets. Redfin is led by Glenn Kelman.