The way we calculate our weekly, monthly and 3 month rates is If you book 7 nights, you are charged for 5 and get 2 free. That averages out to the price per night in the 7 Nights+ column. If you book for 28 Nights, you are charged for 3-1/2 weeks of the weekly rate, so, you get another half week free. That comes to an average of the price per night shown in the 28 Nights+ column. Then, if you stay 90 Nights + at the monthly price we will give you a $300 rebate after 90 Nights. These discounts are not automatically calculated booking online. Please call to book 7 nights or more so we can adjust the price accordingly.