As of Nov. 25, LoopNet counted more than 2.5 million as members. The popular site has also been attracting plenty of unique visitors in recent months. In late November, ComScore Media Matrix reported that LoopNet drew an average of 915,000 unique visitors per month during the first 11 months of 2007. LoopNet has grown its registered membership base by more than 50% during each of the past two years. The San Francisco-based company is the largest online commercial real estate marketplace for properties located in the U.S. and Canada.