Bondev Midrand (Pty) Ltd, a property developer, sold residential erven in the Midstream Estate to the respondents. The title deeds contained a registered condition obliging purchasers to erect a dwelling within 18 months, failing which Bondev would be entitled, but not obliged, to claim re-transfer of the property against repayment of the original purchase price. The respondents failed to erect dwellings within the prescribed period. Several years later, Bondev instituted proceedings seeking re-transfer of the properties. The respondents raised prescription as a defence, contending that Bondev’s claim constituted a ‘debt’ which had prescribed after three years in terms of the Prescription Act 68 of 1969.