That building is The Corinthia Hotel London
“The building housed Great Britain’s government offices in World War I, and in World War II it was an official spy agency, complete with secret tunnels that connected beneath London. After, it sat vacant for many years.”
https://petergreenberg.com/2016/02/11/hotel-past-corinthia-hotel-london/
That building is The Corinthia Hotel London
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Wasn’t it also in the latest John Wick movie?
Is that hotel somehow tied to the Vatican?