It's one of the most photographed homes in the country - and on Friday, its resident could change as the election results sweep in.
But how much is 10 Downing Street worth - and what could you expect to pay for it if it went on the market tomorrow?
The building has been home to some of the most important decisions affecting Britain for the last 275 years - but before then, it was actually a medieval brewery.
Its famous black door was originally made of oak but was replaced by a blast-proof one in 1991 after an Irish Republican Army (IRA) bomb exploded in the garden.
And its iconic black bricks are actually yellow underneath. They were blackened by London smog in the 19th century and then painted black during the 1960s since people had become used to seeing them that way.
It's home to around 100 rooms - but its prestigious Cabinet room, located upstairs, is separated from the rest of the house by soundproof doors.
But how much is it worth?
With an estimated size of 3,800 square feet, the bricks and mortar value of No.10 Downing Street is an estimated £5.3million, according to estate agent Stone Real Estate.
However, with the real size unknown, and with its history of famous residents, the actual value is likely to be much higher.
While the value of No.10 Downing Street requires a bit of guestimation, the most expensive No.10 property sold to date in the UK was in Kensington and Chelsea’s Ilchester Place - and it sold for a tidy £12.8million.
Looking across the nation, Bedfordshire is home to the highest average sold price for 'No.10' homes, going for £881,445.
Cheshire comes in second place with No.10 properties going for an average of £564,250, followed by Greater London (£515,000), Surrey (£425,000), Hertfordshire (£408,998), Buckinghamshire (£374,000), Oxfordshire (£366,500), West Sussex (£329,975), Essex (£322,250) and Dorset (£320,000).
However, at the other end of the scale, the No.10 averages an impressive £2.3million in Westminster, £1.9million in Kensington and Chelsea, and £1.3million in Camden.
If you want a more affordable slice of the No.10 action, head to County Durham or South Yorkshire where a property numbered as such will cost you less than £150,000.
"Who would have thought the average cost of a number ten property could vary by as much as £700,000 across the nation and sell for as much as £12.8m at the top end of the market?," explained Michael Stone, at Stone Real Estate.
"While these are unlikely to be die-hard fans of politics numbers and names can have a big influence on homebuyer decisions, and we've highlighted before how the number 13 previously suffered with a lower sold price due to buyer superstitions.
"You’d be forgiven for thinking that recent political events may have had the same impact on the number 10 although it seems to be more in demand in some areas than it is in others."
