Additional insured status is created by an endorsement attached to your tenant’s liability policy. Not by the lease requiring it, not by a certificate reporting it. Three ISO forms get named in commercial leases, only one of them was drafted for a building owner, and every one is limited by a phrase about what the liability arose out of.
The endorsement is the grant
A liability policy has a section describing who counts as an insured. An additional insured endorsement amends that section to add somebody who was not there before, and it describes, in its own words, the limits of what the addition reaches.
Everything else in this area is administration around that document. The lease is an obligation to obtain it. A certificate is a summary reporting that it was obtained. A broker’s email confirming it is a person’s recollection of a document. The endorsement is the only one of the four that a claims department reads, and it is the only one that changes the policy. What those other documents prove, and where they stop, is treated in the certificate versus the policy; the distinction between being added to a policy and being named on your own is treated in named insured versus additional insured.
CG 20 11 was written for your relationship
The form built for a landlord and tenant is CG 20 11, Additional Insured — Managers or Lessors of Premises. Its title says who it is for, which is unusual and useful.
It adds the person or organization shown in its schedule as an insured, with respect to liability arising out of the ownership, maintenance or use of that part of the premises leased to the named insured. Then it carves back out, in the form itself, two things worth knowing before you rely on it: it does not apply to any occurrence taking place after the tenant ceases to be a tenant of those premises, and it does not extend to structural alterations, new construction or demolition operations performed by or on behalf of the person added.
Read as a whole, it is a well-shaped instrument. It gives a building owner a share of the tenant’s limits for claims growing out of the space that tenant occupies, which is exactly the exposure a lease is trying to allocate, and it declines to insure the owner for being an owner. That second half is the part that gets forgotten.
The two contractor forms, and why they end up in leases
CG 20 10, Additional Insured — Owners, Lessees or Contractors — Scheduled Person or Organization, is the endorsement of the construction world. It adds the scheduled party with respect to liability caused, in whole or in part, by the named insured’s acts or omissions in the performance of the named insured’s ongoing operations. It is the right form when your tenant is having work done and you want status on the contractor’s policy while the work is happening.
CG 20 37, Additional Insured — Owners, Lessees or Contractors — Completed Operations, is its companion. Ongoing-operations wording stops when the work stops, and completed-operations wording is what continues to answer for that work afterward. On a build-out you are paying for, the pair together is the request; either alone leaves half the timeline.
Both of these get copied into commercial lease templates, sometimes instead of CG 20 11 rather than in addition to it. The mismatch is easy to miss and it is not cosmetic: a lease that names only a contractor form has asked for status framed around somebody’s work, in a relationship whose subject is somebody’s occupancy of your building. Vendor and contractor requirements are worth their own separate treatment, and where a manager is running the property on your behalf the same discipline applies to them — that is in what your property manager should do about insurance.
The scope phrase is where owners fall out
Every one of these forms turns on a description of what the liability grew out of. CG 20 11 speaks of the part of the premises leased to the tenant. The contractor forms speak of the named insured’s work or operations. None of them speaks about you.
So the claims that sit outside your additional insured status are predictable, and they are the claims building owners actually get. A fall in a parking field you maintain. Ice on an approach that is not part of anybody’s demise. A stairwell, a shared corridor, a common restroom. An allegation that a condition of the structure was known and left. Anything at all arising from the parts of the property you retained.
Those belong to your own general liability placement, and they are the reason a building owner needs a program of their own rather than a share of somebody else’s. A full owner-side placement is described in what lessor’s risk insurance is, and the allocation question underneath all of it — who is buying what, under a net lease — is NNN leases: who insures what.
Real-World Scenario: A tenant occupies a suite in a multi-tenant building, carries good limits, and has properly endorsed the owner onto their liability policy using the managers-or-lessors form. A visitor arrives for an appointment with that tenant, crosses the shared lot, catches a foot on a broken edge of pavement and is badly hurt. The owner tenders the claim to the tenant’s carrier, reasonably, because the visitor was there to see the tenant. The tender is declined. The endorsement answers only for liability growing out of the leased space itself, and the pavement is leased to nobody — it is the owner’s, maintained by the owner, and the allegation is about the owner’s maintenance. The status was real, the certificate was accurate, and the defense is the owner’s to fund.
Primary and noncontributory is a different ask
Additional insured status answers whether the tenant’s policy has an obligation to you. It does not answer whether that obligation comes first.
Left alone, both policies carry other-insurance provisions and each can argue the other should respond before it does. Two carriers arguing about sequence is not a coverage problem in the abstract and is very much one in practice, because somebody has to fund a defense while the argument runs and the somebody is usually you. Asking that the tenant’s coverage apply on a primary basis and without seeking contribution from yours is a normal lease requirement, it is achieved by wording or endorsement on the tenant’s policy, and it does not arrive automatically alongside additional insured status.
The same question runs upward. Whether your tenant’s excess layer recognizes you at all depends on that layer’s own terms, which is a matter for the umbrella rather than for the primary endorsement.
Blanket wording, and reading it before you accept it
Many tenants carry a blanket endorsement rather than one naming you: additional insured status is extended to any person or organization the tenant has agreed in a written contract, executed before the loss, to add.
Blanket wording is generally good news. It scales, it does not need reissuing when a lease is amended, and it removes the failure mode where your name was simply never typed into a schedule. But it makes your status conditional on your own lease, so two things become worth confirming: that the lease actually contains the requirement in writing, and that it was signed before the loss rather than being under negotiation when something happened. Ask for the blanket wording itself, and read what it conditions status on.
What the clause should say
Draft the outcome, then name the route. A lease that only names an edition of a form can put a tenant in breach of a requirement nobody can currently satisfy, because editions get withdrawn.
The durable version states four things: that the owner and any manager or lender the owner designates are to be added as additional insureds on the tenant’s general liability and excess policies; that the status is to extend to liability arising out of the tenant’s use and occupancy of the premises; that the coverage is to apply primary and noncontributory to any insurance the owner carries; and that the tenant will provide copies of the endorsements, not merely certificates, at inception and at each renewal. Naming CG 20 11 as the expected form is useful and belongs alongside the description rather than instead of it. The same clause is usually the right home for the waiver requirement, which has its own mechanics in waiver of subrogation in a commercial lease.
When the endorsement arrives, actually read it
Check four points and the whole exercise takes less time than chasing the document did. Is the entity named the entity that owns the building, spelled the way it is spelled on your deed. Which form and edition was used. Does the scope wording describe leased premises or somebody’s operations. Is there separate evidence of primary and noncontributory wording.
Then file it where the lease lives rather than where certificates go, and repeat it at renewal, because a policy that lapses takes your status with it silently. Where the property is one the public walks through all day, that discipline matters more — the retail exposure is a function of how many people cross ground you retained. And where allegations concern how tenants are selected or accommodated rather than how anybody was hurt, no additional insured endorsement is the answer; tenant discrimination is a separate line for a separate reason.
General background on business liability paperwork is published by the Insurance Information Institute, with the NAIC’s consumer material covering the same ground from the regulator’s side, and the Small Business Administration covers the tenant’s side of the same conversation. Endorsement forms are filed state by state and each regulator is listed by the National Association of Insurance Commissioners.
None of this substitutes for advice from your own attorney, who owns the drafting. If you have a folder of certificates and no endorsements in it, send the folder and one lease — the gap between what the leases require and what the endorsements grant is usually visible in a single pass.