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 American Post Card Co.
Note the spelling of "colonnade."
There are two other images numbered 24:
Reuse of image numbers and different image series make it difficult to know how many images Otto published.