Online real estate company, Zillow.com, just got another $25 million in venture capital, reports the Seattle Post-Intelligencer. Why? CEO Spencer Rascoff says the company wants to be numero uno.

It’s already the 11th most popular real estate site and Rascoff compares it to a cable channel with independent programming about real estate. It has already hooked up with Yahoo. When I checked out the site, it immediately advertised a Nevada mortgage broker.

And Zillow says that it already has money over from its last round of financing but that it is trying to build a war chest to ensure it’s ready for future battles. And with some $18 billion in real estate, financing and mortgage advertising up for grabs, why not? Rascoff says he fully intends to add listings to the site so that people will have knowledge about prices when they shop.

The scary thing for Realtors is that Zillow is promising to deliver the efficiencies of the Web to the real estate industry and take the guess work out of knowing what the “comparables” are in any neighborhood. Already, Zillow claims it can give instant valuations on 67 million homes. All that Web stuff doesn’t bode well for local agents, say the Freakonomists. See this March column in the Business Press if you want check out why they are so pesssimistic about Realtors.