The sustainable home improvement store TreeHouse is the first-of-its-kind store to go national. TreeHouse co-founder and president Jason Ballard plans to open midsized stores in centers with co-tenants like those in his flagship Austin store: HEB Central Market, Whole Earth Provision Co and a movie theater. One of the first stores might be in the like-minded sustainability city of Seattle. Other possibilities are S.F., Boulder, CO, and Portland, OR (though no definite sites have been announced). Store offerings: non-toxic and energy-efficient building products, flooring made from recycled material, natural cleaners, LED lighting, solvent-free finishes, water-conserving cisterns and solar-energy systems. Jason also says the products will pass a screening process based on health impact, performance, sustainability and corporate responsibility.