Downshire House is often cited as the place where in the summer of 1907, the Olympic & Titanic were conceived by Lord William Pirrie and J. Bruce Ismay. At the time the house was the London residence of Harland & Wolff chairman Lord William James Pirrie. An authoritative source for the oft-repeated claim is unknown.
The building is now home to the Spanish Embassy.
I was attracted by the name Downshire I have in my ownership an oak and steel bound plate chest with a brass plate attached reading Lady Downshire,4 charles street,london W1.I have googled charles street and it is off berkely square in mayfair london.any connection?