Louis owns a 10-unit apartment building. Last week he entere…

Louis owns a 10-unit apartment building. Last week he entered into a written lease with Tina, a new tenant, which provided that she would lease Apartment 8 in his building “for $12,000 per year, payable at $1,000 per month.”  There is no other provision in the lease specifying when its term will end. What estate does Tina have?