The first appellant (Bonheur) and the first respondent (Caribbean) were co-owners of an undivided share in residential property in Morningside, Johannesburg. Bonheur held a 54% share and Caribbean held a 46% share, which they acquired in January 2006 from prior owners Vinella and Riverbend respectively. The property was adjacent to an office park and shopping centre developed by Bonheur and governed by the Morningside Wedge Office Park Owners Association. On 25 September 2008, Caribbean sold its 46% share to Wedgeport (Pty) Ltd. Transfer was effected on 1 December 2008, and on the same day a mortgage bond was registered over Caribbean's share in favour of Ettin and Greenberg as security for a loan made to Wedgeport. Bonheur had not consented to the sale. The appellants claimed there was a 'de facto' right of pre-emption arising from three sources: the articles and memorandum of the Association; a co-owners' agreement; and a joint venture development agreement (JVD agreement). A letter of intent dated 12 August 2005 had been signed by the predecessors of Bonheur and Caribbean, as well as by Ettin and Greenberg, referring to a proposed co-ownership agreement and the JVD agreement. However, neither the co-owners' agreement nor the JVD agreement was ever signed by Bonheur or Caribbean.