Borsody Auction House

Auction house of Borsodi Brothers is an impressive three-storey building in Free City of Novigrad, belong to Borsodi Brothers from (as name tells) House of Borsodi. It's located on the square at the Main Street, in the most representative part of the city. Auctions are held only once every three months, on Fridays.

Hearts of Stone Expansion
In first expansion for the Witcher 3, Vimme Vivaldi tells us that current the kingdom of Redania, Radovid V made a deal with Horst Borsodi that if he move auction house to his kingdom pearl - Oxenfurt, he will grant him beneficial interest - zero procents.