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Another week, another real-estate deal.

The booming online retailer has agreed to lease all 110,000 square feet of office space at 202 Westlake, a six-story building now under construction in Seattle’s South Lake Union neighborhood, real-estate sources say.

Word of the deal comes just two weeks after Vulcan Real Estate announced it will break ground in January on two more South Lake Union buildings that Amazon will lease long-term.

Before the latest agreements, Amazon already leased about 2.7 million square feet in South Lake Union and the Denny Triangle.

It also plans to start construction next year on a 3.3 million-square-foot high-rise complex on three blocks it is buying in the Triangle.

Spear Street Capital, of San Francisco, broke ground on 202 Westlake this spring without a signed tenant.

The building, at Westlake Avenue North and John Street, was greater downtown’s first “spec” (speculative) office project since the real-estate bust.

Broker Cleita Harvey, of Urbis Partners, who represents 202 Westlake, told an industry gathering earlier this year that a tentative deal had been signed but didn’t name the tenant.

The building is scheduled to be finished in about a year. Spear Street declined to comment Thursday.

Amazon has been looking for more office space to accommodate more employees to keep up with its rapid growth.

Its website lists about 2,000 job openings in Seattle for positions as varied as economist, software-development engineer and executive assistant.

The company reported 69,100 employees worldwide at the end of June, up from 65,600 three months earlier. It does not disclose how many of its employees are local.

Spear Street’s 202 Westlake is just three blocks down Westlake from the two buildings Vulcan plans to build for Amazon, which will lease 365,000 square feet there.

Amazon’s 11-building South Lake Union headquarters complex, also built and owned by Vulcan and recently listed for sale, is just to the east.

Amazon’s total office space in Seattle — current and planned — now is about 6.5 million square feet. That’s the equivalent of more than four 76-story Columbia Centers.

Spear Street, Amazon’s new landlord, has invested heavily in the Seattle office market over the past. year.

In addition to 202 Westlake, it has bought 11-story Metropolitan Park North in the Denny Triangle and the two-building First and King complex, once owned by Starbucks, in Pioneer Square.

Seattle Times business reporter Amy Martinez contributed to this report.

Eric Pryne:

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