Rent Commencement Date

How the date gets set

Some leases simply name a calendar date. Many define it by formula instead: a stated number of days after the landlord delivers the premises, after substantial completion of landlord's work, or — in retail — the earlier of a fixed outside date and the day the tenant opens for business. Formula-based dates protect the tenant when delivery slips, but they also mean the lease itself does not tell you when rent started; the answer depends on events that happened after signing.

Why the date matters

The rent commencement date anchors more than the first check:

• The rent schedule and each escalation anniversary run from it.
• Term expiration — and therefore renewal and termination option windows — is often measured from commencement rather than from signing.
• Free-rent burn-off and any deferred-rent recapture on default key off it.
• Estoppel certificates routinely ask the tenant to confirm it, so both sides need to agree on what it was.

Because so much hangs on it, parties commonly execute a commencement date agreement (or commencement letter) once the triggering events occur, converting the formula into a stated date. The recurring problems are documentary: a letter that was never signed, a letter that conflicts with the lease formula, or an amendment that reset the term without restating the commencement dates. Practice also varies on terminology — some documents use one commencement date for everything, others define lease, delivery, and rent commencement separately — so it pays to check which defined term a given clause actually references.

In your documents

Across a portfolio, rent commencement dates live in a mix of lease definitions, commencement letters, and amendments — and every downstream date depends on getting them right. Critical-date tracking keeps the derived deadlines visible, and source-linked answers let you trace any date back to the document that established it.