303 Battery

World’s first net zero apartment high-rise sets a new sustainability standard through innovative modular system

In Seattle’s Belltown neighborhood sits the world’s first net-zero apartment high-rise (as certified by the International Living Future Institute). At 15 stories, 303 Battery offers 112 apartments, 27 of which are deemed affordable housing, along with a rooftop deck and ground-floor retail spaces. While its 506 solar panels on the roof, residential balconies and south-facing wall are an impressive feature, 303 Battery’s most unique component is perhaps the building itself – which is constructed of a proprietary premanufactured modular system within a steel-frame column and beam exoskeleton.

Location Pin Icon
Seattle, Washington
Cube Measurments Icon
Square Feet:
Building Icon
Geometric Shapes Icon
Pie Chart Icon
Commercial, Modular, Multi-Family Residential, Sustainable Design
Material Shapes Icon
Primary Material:
Concrete, Steel

As the brainchild of Sustainable Living Innovations (SLI) in partnership with DCI and CollinsWoerman, the SLI system is a kit-of-parts designed to improve speed of construction, particularly on tight site locations like city orphan lots that otherwise lack the capacity to accommodate typical construction activities.

Project Highlights

  • Features 506 solar panels: 228 on the roof, 112 on the west balconies and 166 on the south wall.
  • A floor-to-ceiling window wall on each unit provides sweeping views of downtown Seattle and for the west-facing units, all of Puget Sound.
  • A first-of-its-kind Performance-Based Fire Design, the project involved thermal and stress analyses, with fire scenario and temperature data from a fire consultant.

Project Team

Damato 920 itok9o ER9c JS

J. Mark D’Amato

Xia 920 itok A Bpp Hwc7

Tom Xia

Erik Pearson web

Erik Pearson

Hanna Saed Headshot

Hanna Saed

Related work

See all
SLI 47+7_SLI20472 B720 Complete

SLI 47+7