AMLI Arc pictured from the Municipal Tower in 2018
AMLI Arc is located in Seattle WA Downtown
Location within downtown Seattle
Alternative namesTilt 49
General information
TypeResidential and commercial
Address1812 Boren Avenue
Seattle, Washington, U.S.
Coordinates47°36′59.55″N 122°19′53.28″W / 47.6165417°N 122.3314667°W / 47.6165417; -122.3314667
Construction startedJune 2015
Topped-outApril 2017
Cost$143 million[1]
OwnerAMLI Residential
HeightSouth Tower: 440 feet (130 m)
Technical details
MaterialPost-tensioned concrete
Floor countAMLI Arc: 41
Tilt 49: 11 (north building)
Floor areaTilt 49: 307,296 square feet (28,548.7 m2)
Design and construction
Architecture firmZGF Architects LLP
DeveloperTouchstone Corporation, AMLI Residential, Mortenson Development
Structural engineerMagnusson Klemencic Associates
Main contractorMortenson Construction
Other information
Number of unitsSouth Tower: 410 apartments
Parking547 parking stalls

AMLI Arc, also known as Tilt 49, is a mixed-use building complex in Seattle, Washington, United States. It consists of two buildings, both facing Boren Avenue between Stewart and Howell streets: a 41-story, 440-foot-tall (130 m) residential skyscraper with 368 apartments to the south; and an 11-story, 307,296-square-foot (28,548.7 m2) office building with retail space to the north.[4] Tilt 49 shares this block with the Kinects residential tower as well as the cancelled Daola Tower.[2][3]

Developers Touchstone proposed the building in 2014 and bought the site, then a Goodyear Tires store and surface parking lot, for $16.6 million.[5] Construction began in June 2015.[6] In 2017, announced that it had signed a lease for the entire 11-story office portion of Tilt 49.[7]

The residential tower topped out in April 2017, and was completed in November.[8]

The name of the office building, Tilt 49, refers to the 49-degree angle at which the Denny Triangle neighborhood is aligned relative to true north, facing instead towards waterfront property on Elliott Bay owned by Arthur A. Denny (for whom the neighborhood is named).[9]


  1. ^ Rosenberg, Mike (March 10, 2017). "Record construction frenzy sweeps downtown Seattle; more building to come". The Seattle Times. Retrieved March 27, 2017.
  2. ^ a b "Emporis building ID 1237833". Emporis. Archived from the original on August 5, 2016.
  3. ^ a b "Tilt 49 Building Fact Sheet" (PDF). Touchstone Development. Archived from the original (PDF) on May 10, 2016. Retrieved May 9, 2016.
  4. ^ "Touchstone starts Tilt 49: two more towers on Boren". Seattle Daily Journal of Commerce. June 5, 2015. Retrieved May 9, 2016.
  5. ^ "Touchstone pays $17M for Boren site". Seattle Daily Journal of Commerce. November 3, 2014. Retrieved May 9, 2016.
  6. ^ Stiles, Marc (June 4, 2015). "Construction of huge Tilt49 office/apartment project begins in Seattle". Puget Sound Business Journal. Retrieved May 9, 2016.
  7. ^ Levy, Nat (March 10, 2017). "Amazon scoops up yet another Seattle office building as it continues to juice downtown construction boom". GeekWire. Retrieved March 10, 2017.
  8. ^ "Mortenson tops out $115M AMLI Arc tower". Seattle Daily Journal of Commerce. April 26, 2017. Retrieved April 26, 2017.
  9. ^ Stiles, Marc (August 29, 2014). "Mega-project aims to connect South Lake Union, Capitol Hill". Puget Sound Business Journal. Retrieved May 9, 2016.