Portland-area home prices have rebounded 4.8% in the last year, the biggest year-over-year gain since April 2007.
Portland-based green building firm Interface Engineering is seeking proposals for a highly sustainable headquarters.
The green roof and green wall business will grow to a $7.7 billion market by 2017.
Portland city planners say that for the central city to continue to thrive, it must grow even more dense.
The Portland area's homebuilding market is the strongest it's been since 2008.