RIBA is based at 66 Portland Place, London—a 1930s Grade II* listed building designed by architect George Grey Wornum with sculptures by Edward Bainbridge Copnall and James Woodford. Parts of the London building are open to the public, including the Library. It has a large architectural bookshop, a café, restaurant and lecture theatres. Rooms are hired out for events.
What is one room in RIBA's headquarters that can no longer be visited by the public?
{'text': 'the Library', 'answer_start': 246}