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Credit Russell Investments Center.
Russell Investments Center.

Online real estate media company Zillow is expanding again in Seattle, this time grabbing two more floors in its headquarters building.

Zillow has leased the top two floors of the 42-story Russell Investments Center. The two floors total more than 38,000 square feet, according to an SEC filing. That brings the company’s total footprint in the building to about 300,000 square feet on floors 29 through 42. The lease means Zillow occupies more than a third of the 886,000-square-foot tower at 1301 Second Ave.

The SEC filing, first spotted by the Puget Sound Business Journal, was made by Kubota Pharmaceutical Holdings Co., the biotech company formerly known as Acucela, which subleases the space from Boeing. Zillow is technically agreeing to “sub-sublease” the space from Acucela. The real estate company will be paying more for the space than Acucela was required to pay Boeing, according to the filing.

Zillow’s lease of the two floors begins in May of this year and runs through at least November 2021.

The company’s last big expansion came in 2014. It leased five floors, totaling about 113,471 square feet that used to be occupied by Seattle biotech company Dendreon. Though the deal happened more than two years ago, Zillow won’t have access to that space until the beginning of next year.

Zillow employed just 300 people worldwide when it moved into the Russell Investments Center in August 2011. It employed more than 2,600 people as of September, and in November posted quarterly revenue of $224.6 million, a record for the company. The company has gone on an acquisition spree over the past few years, including swooping up its chief rival Trulia in 2015 for $1.2 billion.

The company this month donated $5 million toward a second building for the University of Washington’s Computer Science & Engineering program, joining fellow Seattle-area tech companies Microsoft and Amazon as big donors on the project.

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