On 9 February 2000, Century City Centre Ltd and the respondent (Shoprite Checkers) concluded a lease agreement for premises in the Canal Walk Shopping Centre in Cape Town, which was then still under construction. The shopping centre opened in October 2000, which triggered the commencement of the lease on 1 October 2000. The appellants (Hyprop Investments and Ellerine Bros) purchased the shopping centre in 2003. The dispute arose over clause 7.3 of the general terms and conditions, which required the tenant to pay a pro rata share of any increases in rates, taxes, VAT, building operating costs and sewerage charges 'measured from the initial valuation date'. Several interim valuations occurred during construction, with a valuation current at lease commencement showing rates of R627,871. The first valuation of the completed shopping centre occurred in October 2002 (effective 1 July 2002), resulting in rates of R13,425,400. In May 2005, the appellants launched an application seeking a declarator as to the respondent's liability and payment of R2,086,766.75 as the pro rata share of the rates increase.