Thx 4 Ur post. Just curious & checked some facts (see below)

"The original numbering of the Downing Street houses was completely different from what we see today. The sequence of numbers was haphazard, and the houses tended to be known by the name or title of their occupants. The current Number 10 started out life as Number 5, and was not renumbered until 1779.

The Downing Street house had several distinguished residents. The Countess of Yarmouth lived at Number 10 between 1688 and 1689, and was followed by Lord Lansdowne from 1692 to 1696 and the Earl of Grantham from 1699 to 1703. The last private resident of Downing's terrace was one Mr Chicken. Little is known about him except that he moved out in the early 1730s."

more in: https://www.gov.uk/government/history/10-downing-street#origins-and-early-inhabitants