AIA/COTE Top Ten Green Projects

Page Tools

Lloyd Crossing Sustainable Design Plan

This computer rendering shows a plan for the Lloyd Crossing neighborhood.
Photo credit: Mithun


  • Location: Portland, OR
  • Building type(s): Regional plan
  • 95% new construction, 5% renovation
  • 8,000,000 ft2 (743,000 m2)
  • Project scope: multiple buildings
  • Urban setting

The Lloyd Crossing Sustainable Urban Design Plan integrates multiple sustainable strategies for energy, water, and habitat to transform and create a new identity for a 35-block, inner-city, commercial area of Portland. The plan lays out a new analytical, design, and economic framework for adding 8 million square feet of development over 45 years while dramatically improving the district's environmental performance. A four-block, mixed-use project, the Catalyst Project, will serve as a testing ground for key elements of the design plan.

This project was chosen as an AIA Committee on the Environment Green Project for 2005. It was submitted by Mithun Architects + Designers + Planners, in Seattle, Washington. Additional project team members are listed on the "Process" screen.

Environmental Aspects

All of the Plan's key environmental strategies work toward the Predevelopment Metrics Goals in the categories of habitat, water, and energy. These goals provide the framework for evaluating and understanding the systemic nature of the interconnected design strategies.

Habitat quantity, quality, and connections will be improved by restoring habitat "patches" within the streetscape that connect to existing habitat corridors. Tree cover will increase from 14.5% in 2004 to 30% in 2050.

Potable water use will be reduced by 62% and annual fees will be reduced by 89% through an integrated water system that includes stormwater management and treatment, and graywater and blackwater treatment and reuse for nonpotable purposes.

Energy demand will be reduced and onsite renewable energy resources, such as daylighting, wind power, photovoltaic systems, and biogas generation, will be harnessed. A shared "thermal loop" will balance heating demands among complementary uses. Solar utilization will increase from 2% currently to 13.7% in 2050, exceeding the pre-development utilization of 5%. The carbon balance will be reduced from 29,000 tons per year to 2,000 tons per year, despite the addition of 8 million ft2 of new buildings. Almost 90% of the power will come from renewable sources in 2050, and carbon neutrality will be achieved through the purchase of carbon credits.

Owner & Occupancy

  • Owned by Portland Development Commission
  • Typically occupied by 8,000 people, 112 hours per person per week; and 21,500 visitors per week, 23 hours per visitor per week


Integrated team, Green framework, Transportation benefits, Stormwater management, Water harvesting, Efficient fixtures and appliances, Graywater, Wastewater treatment, Massing and orientation, Glazing, Passive solar, Lighting control and daylight harvesting, Efficient lighting, On-site renewable electricity, Daylighting, Natural ventilation

next topic:
Go to next topic: Process

Last updated: 4/25/2005

Our thanks to the ENERGY STAR program of the U.S. Environmental Protection Agency, and to the U.S. Department of Energy, and to BuildingGreen, Inc. for hosting the submission and judging forms.

For more information about the AIA/COTE Top Ten Green Projects, contact AIA/COTE. For help on how to use this Web site, contact .

Footer Navigation

Copyright & Privacy

  • © The American Institute of Architects
  • Privacy