I spent some time working with a firm of corporate solicitors whose address was 1 St Paul's Churchyard. Nice address, and very swanky it was too. Lovely views over the cathedral.
They had a bloke there who was effectively a butler, although I doubt that was his official title! A lot of the time we spent there was out of office hours for reasons of confidentiality. This bloke - who was always on duty - knocked up bacon sandwiches, made travel arrangements for anyone, even sorted out dry cleaning collection and delivery.
I never saw the bills, but I'm sure the bank paid handsomely for the legal expertise and the associated services!