The Idaho Building in downtown Boise is a “descendant” of several other Idaho buildings stretching back to the 1893 World’s Fair. Idaho Press history columnist Rick Just tells this story in “A little slice of history: The downtown Boise buildings story”, published on May 22, 2021.

The Idaho State Building at the 1893 World’s Columbian Exposition. [Image from Johnson, Rossiter A History of the World’s Columbian Exposition Volume 4 – Congresses. D. Appleton and Co., 1898.]
Just explains:
It used 22 types of lumber, all from Shoshone County. The stonework came from Nez Perce County and the foundation veneer was lava rock from Southern Idaho, which had an abundance. The interior was uniquely Idaho. A frying pan clock with golden hands was set to Idaho time. The men’s reception room had a hunting knife for a latch. Some chairs were made from antlers and mountain lion skins.
Read the full story here.