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In page Climate change in Washington:

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Green building has proven not only to be good for the environment but for economic gains as well.[citation needed] A green building can yield increased value to the owner. A "green" designation can also increase a buildings market value as assessed by appraisors and investors.[1] An upfront cost of 2% to support green design would on average result in life cycle savings of 20% of total construction, more than ten times the initial investment costs. An initial investment of $100,000 to build green in a $5 million project would result in savings of $1 million over the lifetime of the building.[2] Green building enhances the community and local economy.