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City permit records suggest ever-expanding is preparing to move into yet another Seattle office building.

The documents indicate mechanical work is being done on Amazon’s behalf on at least five floors — about 100,000 square feet — in the 15-story 1800 Ninth Avenue Building, at Ninth Avenue and Howell Street.

Those five floors — eight through 12 — and the two below have been vacant and available for more than two years, according to commercial real-estate databases.

They remain unleased, Bill Pollard, a principal with Talon Private Capital, one of the building’s owners, said Thursday.

He declined to discuss Amazon: “We don’t discuss activity until we have leases signed.”

Amazon had no comment.

A joint venture of Talon and Prudential Real Estate Investors bought 1800 Ninth in December 2011 from Regence Blue Shield, which leased back about 30 percent of the space.

Over the past year the new owners have renovated the lobby and made other improvements.

Amazon’s growth has been a big factor in the Seattle office market’s recovery from the recession.

Over the past three years the company has moved into about 2.8 million square feet of new space — 1.7 million at its South Lake Union headquarters campus, plus 1.1 million it leases in four buildings in that neighborhood and the Denny Triangle.

Amazon also has agreed to lease another 500,000 square feet in South Lake Union projects that are under construction or scheduled to break ground soon.

And it is expected to start construction shortly on the first phase of a three-block Denny Triangle high-rise complex that will total 3.3 million square feet.

The 1800 Ninth building is about three blocks from the nearest building Amazon already occupies.

The company’s website listed more than 2,800 Seattle job openings Thursday.

Eric Pryne:

or 206-464-2231