On Thursday, we and 700 others headed to downtown LA to watch LoopNet make a 12-story office building disappear. And David Copperfield didn't even have to take over the online real estate marketing firm. The CoStar subsidiary created the effect using state-of-the-art 3D projection. The whole deal was a marketing stunt to promote LoopNet's Premium Lister product and tout its 6.5 million registered members and 3.5 million monthly visitors. But folks still thought it was pretty cool--especially those who want to use the technology to make their competitors disappear. (And when they found the building after the event, Manti Te'o's girlfriend was inside.)

Grammy-winning group Train performed. CoStar partnered with the band to give a $10k donation to Family House, which provides temporary housing to families of seriously ill children at Benioff Children's Hospital in San Francisco, and Little Kids Rock, which provides free instruments and music instruction to underserved schools across the country.

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