Zillow.com has priced its IPO stock offering at $20 a share, putting the online real estate company at a valuation of $539 million.

The company will begin trading tomorrow on the NASDAQ under the ticker symbol "Z." and expects to raise up to $71 million by selling about 3.4 million shares of stock. It had originally expected to sell its shares for $12-$14, but bumped the pricing of its IPO up to $16-$18 last week.

In addition, the IPO’s underwriters can buy more than 500,000 shares.

As TechCrunch notes, the fluctuations in Zillow's pricing are similar to those of LinkedIn and Pandora before they went public. Both companies experienced post-IPO fluctuation in share value as well, though they've since evened out.

As Greg reported in his preview of Zillow's IPO today, the company is still losing money, but has cut its losses at time when its revenue (and traffic) is rapidly growing -- both factors that could affect how the market responds tomorrow.

Founded in 2005 by Richard Barton and Lloyd Frink, Zillow is backed by $87 million in venture capital from Benchmark Capital and Technology Crossover Ventures and others.

Related coverage: Zillow IPO might test waters for smaller tech companies