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It was in fact built as three private houses. Sir George Downing acquired the land and built a number of townhouses. They were built between 1682 and 1684. There were between 5 and 20 houses originally (historians aren't clear). They were designed by Sir Christopher Wren. It was only in 1735 when the First Lord of Treasurer (now known as the Prime Minister) acquired the house.

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15y ago

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