This is a photo of the 1909 World's Fair held in Seattle, the Alaska Yukon Pacific Exposition. It shows an exhibit hall prior to the opening of the fair, so it is probably a reprint of a photo taken by Frank Nowell, the official photographer. Apparently Otto printed it on contract for the Central News Co.
Otto also printed a photo of this building using a different negative. This time it was printed for the American Post Card Co.: