The rapidly expanding electronic signature company would get more space in moving to the Wells Fargo Center from its current space in the Russell building.

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DocuSign has signed a lease to occupy nearly 119,000 square feet of space in the Wells Fargo Center in downtown Seattle.

The lease at 999 Third Ave. amounts to more than five floors, brokerage Colliers International said in announcing the deal. That’s a significant expansion for the electronic-signature company, which now occupies about 85,000 square feet in the Russell Investments Center on Second and Union.

A DocuSign representative declined to comment. (Update, 1:50 p.m. Dec. 3: DocuSign confirmed the “long-term” lease and said it would begin moving in in June 2016. )

DocuSign may be feeling cramped by the fast-expanding Zillow Group, which last year announced it would occupy 12 floors, more than 268,000 square feet of space, in the Russell building by 2017. Two of the five new floors Zillow is filling are currently home to DocuSign.

Founded in Seattle in 2003, DocuSign is now headquartered in San Francisco and expanding quickly.

The company raised more than $300 million in series F financing this year, and has raised more than $525 million since it was founded.

The company has long been rumored to be a candidate for an initial public offering. Company officials have not been shy in saying as much.

DocuSign’s move into the Wells Fargo Center has been rumored for about five months, said Matt Christian, executive director at Cushman & Wakefield-Commerce.

DocuSign employs more than 560 people in Seattle and more than 1,500 globally.