© Harry Dorset, Autumn 2011; used with permission

It’s on a building at 68 King William Street, London EC4N 7HR.

Here is the Google StreetView, for a rough idea. [The clock is visible, the owl, not.]

Owl Bait:

• King William Street is a prominent example of The City of London’s ‘Bank Conservation Area.’
• KWS was laid out in 1829-35 to connect the new London Bridge, designed by John Rennie, to Bank and Moorgate completed in the 1840s.
• Estate agents continue to describe the building as ‘The Gateway to the City.’
• The current occupant of the building is House of Fraser. 
• An earlier occupant was a venerable British company called Guardian Insurance. It still has an owl as its logo.

ThSM