Oman died in August 1826, but the hotel continued to operate under the ownership of his widow, Mrs Grace Oman (née Burns). The exiled Charles X of France stayed at the hotel for a brief time in 1832, during his second period of exile in Edinburgh. Following Mrs Oman's death in 1845, 6 Charlotte Square was sold by her heirs to Alexander Campbell of Cammo, who lived in the house with his family until his death in 1887. Campbell commissioned David Rhind to make various alterations and additions to the house in 1867. The next owner of the house was Sir Mitchell Mitchell-Thomson, 1st Baronet, who was to make it his home for the next 30 years. A partner in his family's timber business, and a director of the Bank of Scotland, he also served as the Lord Provost of Edinburgh from 1897 until 1900. In 1889, Mitchell-Thomson employed the architect Thomas Leadbetter to carry out further alterations.