Blog values Zillow at $225 million

Company not ranked on top-25 startups list

A tech blog estimates that online real estate valuation and marketing company Zillow is worth about $225 million, though the blog acknowledged that it lacked detailed financial information for the company.

This valuation, by the New York-based Silicon Alley Insider blog, is based on $87 million raised through three rounds of financing, the real estate market downturn, a "relatively flat growth rate," and "the challenge of compiling accurate estimates of house values."