Online retailer Amazon.com has signed a long-term lease for 381,491 square feet at the in-development Midtown21 office building at 1007 Stewart St. in Seattle, WA.

Trammel Crow Company (TCC) is developing the 21-story office tower with an anticipated delivery date in December 2016. Amazon will occupy the entire property later in 2017, save a 5,800-square-foot, ground-floor retail space still listed for lease.

Nick Carkonen and Scotta Ashcraft…