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In July 1997, Dan Farley leased a building to Robert Shelter for a period of fifteen years at a monthly rental of $1,000 with no option to renew. At that time the building had a remaining estimated useful life of twenty years. Prior to taking possession of the building, Shelter made improvements at a cost of $18,000. These improvements had an estimated useful life of twenty years at the commencement of the lease period. The lease expired on June 30, 2012, at which point the improvements had a fair market value of $2,000. The amount that Farley, the landlord, should include in his gross income for 2012 is