Bob Buttons, a cash basis calendar year taxpayer, owns and operates an apartment building. During 2015, he received the following pavmen.What is the amount of Bob's gross rental income for 2015? Lease cancellation fee from an old tenant Rent from a new tenant covering the period from July 1, 2016 Security deposit on June 30, 2015, to be returned to the tenant ifno damage h occurred $2600 5,000 2,000 Deductible maintenance rental expenses paid by tenants 4,000