Tower of Commerce

From Memory Alpha, the free Star Trek reference

The Tower of Commerce is the capitol building of the Ferengi Alliance, the largest and tallest building on Ferenginar. From the Tower's Chamber of Opportunity, the Grand Nagus presides over the entire financial empire of the Ferengi. And in the Chamber of Petitioners, the Nagus dispenses financial advice to his subjects.

The Tower also houses the offices of the Ferengi Commerce Authority. Liquidator Brunt had his offices in the Tower of Commerce until he was ejected from his job in 2373. (DS9: "Family Business", DS9: "The Magnificent Ferengi") Quark also briefly worked in the Tower as First Clerk to Grand Nagus Zek (DS9: "Ferengi Love Songs")

On Ferenginar, some criminals and financial deviants are taken by the FCA to the top of the spire of the Tower of Commerce and shoved off to plummet into the Sacred Marketplace, a full 40 stories below, where people bet on where the victims will land. (DS9: "Bar Association")