Knyvet House
Knyvet occupied as his London townhouse the first house known on the site of 10 Downing Street, the modern-day residence of the British Prime Minister, in a large timber and brick building with an L-shaped garden. It was first leased to him in 1581 by Queen Elizabeth I at which point it became known as Knyvet House, and his lifetime lease was extended in 1604 to extend to his heirs. The house was described by the parliamentary commissioners in 1650 as:
"...built part wth Bricke and part wth Tymber and Flemish qalle and covered with Tyle, consistinge of a Large and spacious hall, wainscoted round, well Lighted, and Paved wth brick Pavements, two parls whereof one is Wainscoted round from the seelinge to ye floor, one Buttery, one seller, one Large kitchen well paved with stone and well fitted and Joynted and well fitted wth dreser boards….
"And above stayres in the first story one large and spacious dyneinge Roome, Wainscoted round from the seelinge to the floore, well flored, Lighted and seeled, and fitted wth a faire Chimney wth a foote pace of Paynted Tyle in the same. Also 6 more Roomes and 3 Closetts in the same flore all well lighted and seeled. And in the second story 4 garretts..."
Knyvett built new lodgings for the women of Princess Mary's household in 1605, and he supervised improvements to St James's Park.
The house passed to his niece, Elizabeth Hampden, aunt of Oliver Cromwell, and in her lifetime it adopted her surname. After the lease expired on Hampden House and garden in 1682, George Downing redeveloped the site and adjoining premises.