The tour was made available in 2016 when Theresa May was the PM.
Nothing special and watching pictures of the building has the same result.
"The property was part of a building project by diplomat George Downing who built it on the site of Hampden House, which was destroyed in the late 18th century. The site was also once host to the Axe brewery. In 1682, Downing employed Sir Christopher Wren to design houses, but as they were built on marshland and cheaply made, they have been in an almost constant state of repair since their construction." Jasmeet Barker in the article "The Dawn of 10 Downing Street".
