I have already recorded Sir James and Dame Mary Jane at Lews Castle in 1861 and her presence there again in 1881. However, in 1871 they were at their London home and she is found there again in 1891.
That home was 13 Cleveland Row and British History Online gives a thorough description: Cleveland Row
The building called ‘Stornoway House’, which can be clearly seen on the plans in the document, was the Matheson residence from 1844 until 1896.
It has a large bay-window that looks the few hundred feet across the corner of Green Park to a rather well-known residence – Buckingham Palace…