Expenses for a 1,000 square foot office space are $6.00 per square foot. The lease specifies an expense stop of $5.40. What is the total expense paid by the landlord?

A 1,500 square foot office space is leased at $12.00 square foot. The space is vacant one month out of the year. Office expenses are $6.50 per square foot and an expense stop is set at $6.00 per square foot. What is the annual net operating income?