- Mortgage agreement for the English Opera House, made between D'Oyly Carte and the Hon. Hubert de Burgh-Canning, Marquis of Clanricarde, and related documents, 1891-1893.
- Building valuation survey for the Royal English Opera House, 1891.
- Sale agreement for the purchase of the Royal English Opera House, made between D'Oyly Carte and Albert Netter.
- Agreement releasing Helen Carte (as executrix of D'Oyly Carte's estate) from the obligations of the 1891 mortgage agreement, with related note, 1901.