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Tenant Estoppel Certificates in California Property Sales

By Matthew Martinez, Founder, CEO & Managing Broker, Diamond Real Estate Group. California DRE #01869679.

A tenant estoppel certificate is a short signed statement in which a tenant confirms the key facts of its lease, such as the rent, the security deposit, the term, any defaults and any options, so that a buyer or lender can rely on them. Once a tenant signs, the estoppel principle in California Evidence Code section 623 generally prevents it from later contradicting those statements against someone who relied on them. In California the duty to sign one usually comes from the lease, not from a statute.

Estoppels are routine in commercial sales and common when apartment buildings change hands. They’re the buyer’s check on the seller’s rent roll, and they decide how the security deposits, prepaid rent and any tenant promises carry over at closing. This guide explains what a certificate covers, when tenants have to sign, how the deposit rules fit in and what to do when a tenant won’t respond. It belongs with our guides to buying property with tenants in place and buying an apartment building.

What does a tenant estoppel certificate confirm?

There’s no single official form. Publishers and lenders use their own, and commercial leases often attach one. A typical certificate, such as RPI’s Form 598 (the Tenant Estoppel Certificate), asks the tenant to confirm these items. Use this list to check a draft; it isn’t a legal form.

Field	What the tenant confirms	Why the buyer cares
Possession and documents	That the tenant occupies under a named lease or rental agreement, and which amendments exist	Side letters and unrecorded amendments surface here
Assignment or sublease	Whether the tenant has assigned the lease or sublet	Tells you who is actually in the space
Term	Start and end dates, and any renewal or extension options	Drives the income you’re paying for
Rent	Current monthly rent and the date it’s paid through	Exposes concessions and prepaid rent
Security deposit	The amount held by the landlord	Sets the deposit credit at closing
Landlord property and improvements	Landlord-owned items in the tenant’s possession; improvements the tenant must or may remove	Affects condition at move-out
Defaults	Whether either party is in breach	Flags disputes and repair promises the buyer would inherit
Options and rights	Any option or right of first refusal to buy, or rights to extend, expand or cancel	A purchase option can follow the property to the new owner
Liens	Whether the tenant has encumbered its leasehold	Matters to the lender

Commercial certificates usually add who pays which operating costs, any unpaid tenant improvement allowance and the status of common-area reconciliations. If a lease includes an allowance the landlord hasn’t paid yet, our guide to tenant improvement allowances explains how that obligation usually moves with the property.

Why buyers and lenders ask for estoppels

A rent roll is the seller’s summary. An estoppel is the tenant’s version, signed. Comparing the two is one of the simplest ways to find what a seller’s numbers leave out: a free month promised at renewal, rent paid in advance, a deposit that was partly applied to past rent, or a repair the landlord agreed to make.

The differences change the price. Rent that’s lower than the roll shows reduces net operating income, and at a given cap rate that lowers the value. Lenders on income property commonly make estoppels a loan condition for the same reason, and for commercial loans they often ask for a subordination, non-disturbance and attornment agreement (SNDA) at the same time. Our commercial due diligence checklist shows where estoppels fit among the other documents.

Sellers benefit too. Reconciling leases, ledgers and deposits before listing means the certificates come back clean, and fewer surprises reach the buyer’s contingency period. Our guide to selling a multifamily property covers the rest of that preparation.

Do California tenants have to sign an estoppel certificate?

Commercial tenants

Usually yes, because the lease says so. Estoppel clauses built on AIR CRE’s standard lease language, which turns up in many filed commercial leases, typically require the tenant to deliver a certificate within 10 days after written notice. If the tenant doesn’t respond, those clauses let the requesting party sign a certificate itself, and the tenant is then estopped from denying the facts in it. Some leases add a penalty, such as an automatic rent increase, for failing to deliver one. Read the actual clause: the deadline, the form and the remedy all vary. Our overview of commercial lease types explains the other lease terms a buyer should check.

Residential tenants

Often no. We know of no California statute that requires a residential tenant to sign an estoppel certificate; the duty, where it exists, comes from a lease clause. RPI notes that a lease must contain an estoppel provision before an owner can require a tenant to sign and return one, and many residential leases don’t have one. Asking politely, explaining that the purpose is to confirm the deposit and rent, and keeping the form short gets better results than pressure. For a single rented house or condo, our guide to selling a tenant-occupied home covers notice and showing rules as well.

Estoppels and the security deposit

California’s deposit statutes decide what happens to deposits when a building sells, and the estoppel is how the buyer confirms the amounts.

Residential (Civil Code section 1950.5(i)). When the landlord’s interest ends by sale or otherwise, the landlord must, within a reasonable time, either transfer the remaining deposit to the successor and notify the tenant, or return it to the tenant with an accounting of any deductions.
Before a voluntary transfer (section 1950.5(j)). The landlord must give the successor a written statement of the remaining deposit, an itemization of lawful deductions and which of the two options it chose.
Commercial (Civil Code section 1950.7(d) and (e)). The landlord either transfers the deposit, after lawful deductions, to the successor and notifies the tenant by personal delivery or certified mail, or returns it to the tenant. A transferee who receives the deposit takes on the same rights and obligations as the landlord who held it.

Check the deposit amounts against the current residential limits. For deposits collected on or after July 1, 2024, section 1950.5(c) generally caps a residential deposit at one month’s rent, with a two-month limit for some small landlords who are natural persons or LLCs of natural persons. A certificate showing more than that on a recent tenancy is a question to raise with the seller.

How estoppels fit into a purchase: step by step

Put it in the contract. State that the seller will request estoppel certificates from the tenants, on a form attached to the agreement, and give the buyer time to review them before removing contingencies.
Pre-fill from the leases. The seller fills in the rent, deposit and dates from the lease file and rent ledger, so tenants confirm or correct facts instead of writing them from scratch.
Deliver with copies. Send each tenant the certificate with a copy of its lease and any amendments, and give them the response time the lease allows.
Compare line by line. Match each returned certificate to the rent roll, the lease and the bank deposits. Note every difference, however small.
Resolve the differences. A discrepancy becomes a price adjustment, a closing credit, a seller certificate covering that unit, or a holdback in escrow until it’s settled.
Keep them current. Lenders often want certificates dated close to closing. If escrow runs long, plan for updated ones.
Take over properly after closing. Under Civil Code section 1962(c), a new residential owner must give tenants the owner and rent-payment disclosures within 15 days. Until it does, it can’t serve a notice or evict for nonpayment of rent that came due during that period, although the tenant still owes the rent.

What to do when a tenant won’t sign

Missing certificates are common, especially in apartment buildings, and they don’t have to stop a sale. Typical fixes:

Enforce the lease. For a commercial tenant, follow the clause’s notice process and use whatever remedy it gives, including the landlord-signed certificate many clauses allow.
Seller certificate. The seller certifies the facts for the missing units and stands behind them after closing, for a defined period.
Payment records. Twelve months of deposit records showing each tenant’s payments can support the rent figures, though not side agreements.
Holdback or price. Where the missing unit matters, escrow can hold funds until the facts are confirmed, or the price can reflect the uncertainty.

Don’t threaten or pressure a residential tenant over a certificate. Many tenants are protected by the state’s rent cap and tenant protection rules, or by stricter local ordinances, and our guide to AB 1482 for landlords explains which apply.

Residential and commercial estoppels compared

Issue	Residential tenant	Commercial tenant
Duty to sign	Only if the lease requires it	Usually required by the lease
Typical deadline	None unless the lease sets one	Often 10 days after written notice in AIR-based clauses
Remedy for no response	Practical alternatives (seller certificate, records)	Whatever the lease provides, often a landlord-signed certificate the tenant can’t deny
Deposit statute	Civil Code section 1950.5	Civil Code section 1950.7
Extra items	Pets, parking, storage, utility billing	CAM and expense reimbursements, TI allowances, options, SNDA

Questions people ask

What is a tenant estoppel certificate used for?

It lets a buyer or lender confirm the lease terms directly with the tenant before closing, including rent, deposit, term, defaults and options. Because of the estoppel principle, the tenant generally can’t later contradict what it certified to someone who relied on it.

Is a California residential tenant required to sign one?

Only if the lease requires it. We know of no California statute that imposes the duty on residential tenants, and many residential leases don’t include an estoppel clause.

How long does a commercial tenant have to return an estoppel?

Whatever the lease says. Clauses based on AIR CRE language often allow 10 days after written notice, but some use business days or longer periods.

What happens to tenant security deposits when a building is sold?

The seller either transfers the deposits to the buyer and notifies the tenants, or returns them to the tenants with an accounting. For residential property this is Civil Code section 1950.5(i); for commercial property, section 1950.7(d).

What if the estoppel doesn’t match the rent roll?

Treat the difference as a due diligence finding. Ask the seller to explain it, and resolve it with a price change, a closing credit, a seller certificate or an escrow holdback before you remove contingencies.

Is an estoppel the same as an SNDA?

No. An estoppel confirms facts about the lease. An SNDA is an agreement among the tenant, landlord and lender about whose rights come first if the lender forecloses. Commercial lenders often ask for both.

If you’re buying or selling a tenant-occupied building, we can help set up the estoppel process, compare the returns against the rent roll and flag what needs a credit or holdback. Start with our investment property services, or contact us about a specific property. Diamond may refer you to partners we work with, such as real estate attorneys; you’re free to choose any provider.

This is general information, not legal advice; talk to a California real estate attorney about your situation and your leases.

Sources & notes

Statute mirrors were used because the Legislature’s site was unreachable; confirm current text at leginfo.legislature.ca.gov.

Last reviewed October 2026 by Matthew Martinez.