What is a lease agreement?
Updated 2026-09-04 · 6 min read
Possession
A lease conveys the right to occupy for a term. Once it is signed, the unit is the tenant's to live in and yours to own.
A lease agreement is a contract that transfers possession of a property for a defined period in exchange for rent. That transfer is the whole point, and it is why a landlord cannot simply walk in, change a lock, or decide the deal is over.
What the document actually does
- Grants exclusive possession for a term.
- Fixes the rent and when it is payable.
- Allocates responsibility for repairs, utilities and insurance.
- Sets what counts as a breach and what happens next.
Everything a lease does not say is filled in by the statute — and the statutory version is rarely the one you would have chosen.
The terms you cannot write out
Every residential tenancy carries implied terms: habitability, quiet enjoyment, and the statutory limits on entry, deposits and termination. A clause purporting to waive them is void, and in several states including it is itself a violation.
The lease loses to the statute, every time
Where a lease clause and a statute conflict, the statute governs and the clause falls. Drafting around a rule you dislike does not disable it; it just costs you the paragraph.
How and when it ends
A fixed-term lease ends on its end date — but what follows depends on what the lease says. Silence usually converts the tenancy to month-to-month by operation of law, which is exactly the outcome most landlords assume they have avoided.
| At the end date | What usually happens |
|---|---|
| Lease is silent | Converts to a periodic (month-to-month) tenancy |
| Lease auto-renews | New fixed term on the stated notice |
| Either party gives notice | Tenancy ends on the notice date |
| Tenant stays, landlord accepts rent | Periodic tenancy, on the old terms |
Which of those you want is a decision — make it in the lease renewal guide rather than by omission.
Rent is a contract term, timing is a statute
The statute says when rent becomes payable — in California, at the termination of each period as it becomes due (Civ. Code § 1947, checked 2026-09-04). The amount, the method, the grace period and the proration rule are all yours to set, which is why how to write a lease agreement spends most of its time on that clause.