Tibet acquired a new office building on 1 October 20X4. Its initial carrying amount consisted of: Land Building structure Air conditioning system $000 2,000 10,000 4,000 16,000 The estimated lives of the building structure and air conditioning system are 25 years and 10 years respectively. When the air conditioning system is due for replacement, it is estimated that the old system will be dismantled and sold for $500,000.