If a current tenant will be renewing his/her lease, track the lease renewal on the unit in your Off-Market Units tab.
In the status column, and select "Renewed" from the dropdown:
A lease detail modal will appear, where you'll be able to indicate a change in rent from the previous lease, as well as new lease start and end dates:
You can see the leases that will be expiring soon and are expired in your Off-Market Units tab so that you can ensure all necessary renewals have been completed.
Lease About to Expire