Alley24 is a mixed-use development in Seattle, U.S.A., that was designed and constructed using the Leadership in Energy and Environmental Design (LEED) certification to maximise sustainability throughout all stages of the project and create an energy efficient building with a high quality indoor environment.

Project Introduction
Alley24 is a mixed-use development in the inner city Seattle neighbourhood of Cascade. The development consists of 17,000 m2 of office space, 172 rental apartments and 2,600 m2 of street-level retail space. Alley24 occupies an entire block and is divided into four-buildings by two pedestrian alleys, which meet in the centre of the development. Sections of a historic building, the New Richmond Laundry facility, have been incorporated into the development.

Skanska provided preconstruction services for the entire US$42 million development, and acted as the general contractor for the office building, underground parking and retail areas. The project was delivered to the client, Vulcan Real Estate, on time and US$3 million under budget. The six story high development opened in February 2006 and is home to over 200 residents and almost 1,000 employees, including the Skanska Seattle office. Alley24 is part of Vulcan’s ongoing redevelopment of downtown Seattle’s South Lake Union neighbourhood.

Alley24 was one of the first mixed-use projects in Seattle to achieve LEED (Leadership in Energy and Environmental Design) certification for its sustainability considerations during construction and energy efficient features. Skanska was involved in three separate LEED projects at Alley24, including the office building shell and core that achieved LEED Silver certification and two corporate offices, including Skanska's, which were awarded LEED Gold certification for their interiors.

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