7,535 sq. ft. 7 bd/6.5 ba. 3-car gar. Wet bar. Wine cellar. MUST SELL NOW. Okay, that last bit isn't part of the listing for Tom Perkins's palatial home in Belvedere , across the Golden Gate from San Francisco. But the fact that Perkins wants to sell his house, in this real-estate market, is disturbing. He is one of the founders of Kleiner Perkins Caufield & Byers, and is fabulously wealthy. He has already started hawking his $187 million megayacht, the Maltese Falcon . What this looks like: Perkins is liquidating his worldly possessions. Let's assume he's not doing this because of financial straits. The only alternative conclusion: Perkins thinks he should sell now, before things get much, much worse.