The Stunning Whirlwind Chamber of Commerce — was the establishment of the Woulsto House of the Four Great Noble Houses. It had four branches and a headquarters. The one Kadyn visited previously was one of the four branches, and it was called the eastern branch.
As for why it was built at such a poor place, it was due to the bet of the two noble houses' leaders — Woulsto and Sweeders. The two leaders made a bet and Woulsto's were defeated. It was only then they realised Sweeders had tricked them.
But it was already too late, the leader of Woulsto couldn't go back on his words in front of so many people. He had to honour his word and move away from the eastern chamber of commerce from Clover Square no matter how unwilling he was, as it was the condition of the bet.