[22] It is the plaintiff's case that initially he entered into a written "lump sum" contract with the defendant for the construction of a commercial/residential high rise building in High Street, Toowong, under the terms of which he was obliged to complete the construction of the building by 25 April 2000 for "a guaranteed upper limit cost of $2,650,000.00", the plaintiff and defendant to share equally any reduction in building cost below that sum. It was agreed that the plaintiff would receive a fee of 7.5% of the construction cost as at completion of the project - ie $198,750.00 if the cost was the upper limit of $2,650,000.00. The total cost of the project therefore would be $2,848,750.00 plus 107.5% of the cost of variations and extras for which the defendant was liable under the contract. In my view this contract should be characterised neither as a lump sum nor cost plus contract but rather as one exhibiting some of the characteristics of both types of building contract.