Separate lease expiry, planned move, charge start, actual return and model horizon.
Control the gap
after expiry.
Price an entered post-expiry occupancy scenario by exact date and charge method. Add custom recurring impacts, expose replacement-tenant or relocation delay and prove every surrender control—without pretending a financial model decides legal status.

Expiry is a date. Surrender is an evidence package.
Choose premium components, proration and custom recurrence instead of assuming one formula.
Keep proposed, draft and signed extensions separate from occupancy and payment facts.
Control keys, condition, restoration, environmental, property and financial evidence.
Price the time gap. Control the possession evidence.
Build the commercial scenario from exact dates and sourced terms. The model can show cost and operational exposure; it cannot decide whether occupancy is permitted, what tenancy exists or which response is lawful.
Identify the parties, premises and controlling file.
Expiry, overholding, surrender, renewal and amendment sources must be read together before the scenario is treated as operational.
Link the date, option, restoration, arrears and relocation decisions.
Use Critical Dates for professionally reviewed reminders, Options & Rights for renewal status, Restoration for make-good scope, Arrears Control for posted charges and Renew or Relocate for the long-term operating decision.