- Although deep time manifests itself in many ways, it resonates more strongly in some locations. One such place is in downtown Seattle at the southwest corner of 2nd Avenue and Marion Street. There you will find a rather lovely art deco structure, the Exchange Building, originally built to house the city’s commodity exchanges. Alas, it opened in 1930 and the Depression prevented the building from meeting the owners’ great expectations. (Talk about bad timing!) But they did choose wisely with their building stone, the Morton Gneiss of Minnesota.