Assume that you are following IFRS 13 and measuring the fair value of a building. The building is currently being rented out. Under IFRS 13, the entity must determine the following: 

(a) How the item could be/is used, 

(b) The market, 

(c) The valuation technique/model. Briefly explain each of these and note how they would apply to measuring the building. How would your analysis change under ASPE?