Lord Foster is set to issue a writ to Bundesbaugesellschaft, the Reichstag public-private client, if it does not pay the money. The move follows a letter from Lord Foster to German parliament speaker Wolfgang Thierse urging him to make the Bundesbaugesellschaft pay.
A Bundesbaugesellschaft spokesperson said: 鈥淟ord Foster has lifted it [the dispute] into a domain it should not have got into.鈥
A Foster spokesperson said: 鈥淚t is a private and confidential matter.鈥