The date this rent step ends. Rents are automatically sorted in ascending date order by step end. The length of time from the Step Start to the Step End (inclusive) must be an exact multiple of the Payment Frequency. So, for instance, a Weekly rent step that starts on a Sunday must end on a Saturday. A Monthly or longer rent step must end on the same day of the month as the prior rent step (the last day of the month matches the last day of every other month for this purpose, even though months have different lengths).
When you change a Step End date, the appropriate Step Start date is changed automatically so that there is never a gap between rent steps. If you add a rent step with a Step End date between two existing steps, the new step's start date is set to the day after the earlier step ends, and the following step's start date is set to the day after the new step ends.