SAT Tower

The 8,000 square foot penthouse on the top floor of SAT Tower rents for forty times the monthly rent of the 2,400 square foot pied-a-terre on the first (ground) floor. My 930 square foot junior 2 on the 15th floor costs $3627 a month. In SAT Tower, the monthly rent per square foot of each floor above the first floor is ten cents more than that of the floor below it. How many stories high is SAT Tower?