The sales professionals affiliated with ZipRealty Residential Brokerage in Texas are joining Coldwell Banker United Realtors, the latter announced Feb. 28. About 145 people will join Coldwell - 70 in Austin and 75 in Houston. Both Coldwell and ZipRealty are owned by NRT LLC, the largest residential real estate brokerage company in the country. "We recognize the long-term value in bringing these talented ZipRealty agents under the umbrella of Coldwell Banker," Helen Edwards, president of Coldwell...