Trending: Inside Zipwhip’s new Seattle HQ, where the culture gets a chance to shine and the sunsets are ‘epic’ has signed agreements that give the company the option to purchase another big swath of land for possible future development in Seattle — suggesting that the tech company doesn’t see its growth slowing down anytime soon.

The potential expansion is just north of downtown Seattle, next to the property where the company already is proceeding with plans for a three-block campus.

The Seattle Times reported the news overnight, after digging up documents filed earlier this year in King County that reference the agreements.

GeekWire confirmed the details in King County property records and put together this map showing the properties that Amazon could purchase under the newly revealed agreement, adjacent to the blocks where Amazon is already moving ahead with its new towers.

Existing occupants of the additional property include the Hurricane Cafe, and Cornish College of the Arts student housing.

File this latest agreement under long-term planning. One of the documents, a “right of first offer” agreement, is in effect for a period of 10 years. Of course, a lot can change during that time period, and there’s no guarantee that Amazon will build a project on the additional property.

However, if it ultimately does, the two projects together would give the company a giant second campus in the heart of the city — accessible via streetcar from the company’s existing campus in the South Lake Union neighborhood, which it recently agreed to acquire that existing campus for $1.1 billion from Microsoft co-founder’s Vulcan Inc.

For the real estate geeks in the audience, here are the two documents between Amazon (through its affiliate Acorn Development) and property owner Clise Properties, revealing the latest property agreements: PDF 1 and PDF 2.

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