The Department for Education has confirmed in a letter to Darlington MP Jenny Chapman that the Mowden Hall site in the town will close.
The decision is part of a review of buildings used by the department. It is expected that staff will be relocated to new site in Darlington or Newcastle.
More top news
On the first day of the meteorological Autumn - what will the weather have in store?
Fans are being warned that counterfeit Rugby World Cup tickets are in circulation. Here is some advice on how to avoid being conned.
George Bulman was found dead between Christmas and New Year at the home he shared with his wife Carol and son Geoffrey in Newcastle.