The case study is about Urban House v Purnell Bros [2007] NSWSC 1248, which deals with the issue of whether the property damage was substantial enough to warrant the buyer's right to rescind the contract and receive a refund of the deposit amount. The court found that the damage caused by the fire was not substantial, and therefore, the buyer did not have the right to rescind the contract. As a result, the seller was entitled to retain the deposit amount. The case relied on the Conveyancing Act 1999, specifically sections 66(L) and (M), which define the circumstances under which a purchaser may rescind a contract due to substantial damage to the property.