Ridgeway House, apparently. Almost makes you want to move in, doesn't it? Sadly I will be otherwise occupied on Thursday 27th.
The line about "located in the superb grounds of ..." was presumably cut short for reasons of space. It should have finished: "... and only five feet away from a bolshie computer network company that doesn't appreciate the privilege of being witness to the cutting edge of modern structural design, but sod 'em because they're moving out next year anyway."
Was this what Flanders & Swann had in mind with their quip: "Architecture, said Hegel, is frozen music ... Donald Swann's music is often compared with defrosted architecture."