The tech giant will occupy all five floors of office space starting next year at the building on Westlake Avenue N.

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Amazon has leased yet another South Lake Union building — this time, the former Tommy Bahama headquarters.

Paul Allen’s Vulcan Real Estate, which has sold or leased many of Amazon’s offices, announced Wednesday that the firm and partner McKinstry have leased their building at 428 Westlake Ave. N. in Seattle to the tech giant.

Amazon will occupy all five upper floors of the six-story building, which has retail tenants such as AT&T and Key Bank on the ground floor. Employees will start moving in early next year after about $2 million in upgrades to the space, which was built by Vulcan in 2004. The lot was sold for $9.2 million in 1999.

The office space has been vacant since Tommy Bahama moved a few blocks east, to a bigger spot on Fairview Avenue North, about a year ago. The building includes a three-story underground parking garage with 143 parking spots.

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The 81,000-square-foot lease might be a significant expansion for just about any other company, but for Amazon, it represents a drop in the bucket. The company is on track to occupy about 12 million square feet of space in South Lake Union — the equivalent of eight Columbia Centers, the tallest building in Seattle, or more than 600 floors. And it has posted more than 10,000 job openings just in the last few months.