>> ninan: the portland skyline is made of millions of tons of concrete and steel. now some architects are turning to a different material-- compressed wood, for its strength and beauty. but some fire experts are raising alarms. cbs news correspondent tony dokoupil has details. >> this is the tallest wood building in the united states. >> reporter: right now, that is? right now woarpt row! it's hard to tell from the outside, but inside, portland developer eric wiley walked us through the latest milestone in wood construction, a nearly-finished eight-story condominium, complete with million-dollar apartments and picturesque views.