Where are all the staff based? Given the previous question, write a context that contains the answer. It can be 1 - 20 sentences. Context:
RIBA Enterprises is the commercial arm of RIBA, with a registered office in Newcastle upon Tyne, a base at 15 Bonhill Street in London, and an office in Newark. It employs over 250 staff, approximately 180 of whom are based in Newcastle.