Trading Depot is a Dwarfs infrastructure building in Total War: Warhammer. Trade depots are effectively inland, underground ports, where merchant caravans from all over the Karaz Ankor offload their wares.
The Guilds have special areas in the higher deeps that receive goods from all over the Karaz Ankor. These depots are effectively inland ports, acting as offloading areas for trade caravans bringing in hops, goats, leather, and bolts of cloth, gems, ores as well as various other merchandise. The depot inevitably has a bustling atmosphere as Guild factors haggle over the prices - decrying the goods of one trader whilst insulting the Ancestor of another, and all the while promoting the quality of their own Guild;s output.