Commercial Lease Assignment vs Subletting: What's the Difference

Assignment transfers the entire lease to a new tenant, who steps into the original tenant's shoes for the rest of the term. A sublease keeps the original tenant on the lease and creates a second landlord-tenant relationship underneath it, so the original tenant stays liable to the landlord. The practical difference is who owes the landlord rent and who keeps control of the space. Both almost always require the landlord's consent, and both can trigger a recapture right that lets the landlord take the space back instead of approving the transfer.

These two clauses decide whether a tenant can sell its business, shed unwanted space, or hand the lease to a buyer in an acquisition. They are also some of the most heavily negotiated and most frequently misread provisions in a commercial lease, which is why anyone reviewing a lease for a deal needs to read them carefully rather than skim for the obvious terms.

What is the difference between assignment and subletting?

An assignment is a full transfer of the leasehold interest: the assignee takes over the entire space for the entire remaining term and assumes the tenant's obligations to the landlord. A sublease is a partial or temporary transfer: the original tenant (now the sublandlord) lets a subtenant use the space but stays directly liable to the landlord under the original lease. With an assignment the original tenant usually wants out completely; with a sublease the original tenant keeps a stake and the risk.

The distinction matters because of liability. Even after an assignment, many leases keep the original tenant secondarily liable unless the landlord grants a release, so a tenant who thinks it has walked away may still be on the hook if the assignee defaults. Under a sublease, the original tenant is always still the landlord's tenant of record, so a subtenant's missed rent is the original tenant's problem.

Does a commercial lease require landlord consent to assign or sublet?

Almost always, yes. Most commercial leases prohibit assignment or subletting without the landlord's prior written consent. The fight is over the standard for that consent. A landlord-favorable lease lets the landlord withhold consent in its "sole discretion," which effectively gives it a veto. A tenant-favorable lease says consent "shall not be unreasonably withheld," which forces the landlord to justify a refusal based on factors like the proposed tenant's financial strength, intended use, and effect on other tenants.

Which standard applies is one of the first things to confirm when reviewing a lease for a transfer, because it determines whether the tenant has a realistic path to assign or sublet at all. A consent clause that looks routine can hide a sole-discretion standard that blocks the deal.

What is a recapture clause?

A recapture clause lets the landlord respond to a request to assign or sublet by terminating the lease (or the affected portion) and taking the space back, rather than approving the transfer. The trigger is often the tenant's own notice: ask for consent, and the landlord can elect to recapture instead. Landlords use recapture when market rents have risen above the contract rent or when they want the space for another use, so a tenant trying to sublet at a profit can find the landlord simply taking the space and capturing that upside itself.

For a buyer in an acquisition, a recapture right tied to assignment is a red flag, because the act of transferring the lease at closing could let the landlord recapture the space. That is exactly the kind of provision that has to be surfaced during diligence, not discovered after the deal is signed.

Why assignment and subletting clauses decide deals

In an acquisition, the buyer needs to know whether each lease can transfer to the buyer entity. A change-of-control provision can treat the sale of the tenant's business as an assignment requiring consent, even if no formal lease assignment is signed. If consent is at the landlord's sole discretion, or a recapture right is attached, the lease may not move cleanly, and a portfolio of such leases can change the price or kill the deal. This is why diligence teams read assignment, subletting, change-of-control, and recapture together as one block.

The same clauses matter to a landlord underwriting a transfer request. The landlord wants to know the proposed assignee's credit, the intended use, and whether a sublease undercuts other tenants' exclusives. Reading those terms accurately across many leases by hand is slow and easy to get wrong, especially when an amendment has quietly rewritten the consent standard years after the original lease.

How to review assignment and subletting clauses across a portfolio

Reading one lease for its transfer terms is manageable. Reading a data room of fifty for an acquisition is where teams run out of time and start skimming. The faster path is to extract the assignment, subletting, consent, change-of-control, and recapture clauses from every lease into one place, each summarized and linked back to its source provision so a reviewer can confirm the exact wording in seconds. Our guide to lease clause extraction covers how AI pulls these operative clauses out of dense lease language, and lease abstraction for paralegals walks through the diligence workflow where these clauses get reviewed for a closing.

Because amendments so often rewrite consent and recapture terms, the lease has to be read as amended, not just from the original document. The broader case for reading the lease with its amendments is in manual vs automated lease abstraction, and the full field list a complete abstract should carry is in our commercial lease abstract template.

What happens after the transfer is approved

Once a landlord consents to an assignment or sublease, the paperwork and the post-deal cleanup begin. The assignment or consent agreement has to be signed by the right parties, which is one place teams turn to an online document e-signing tool to get the three-party agreement executed without printing and scanning. The landlord typically underwrites the incoming tenant's credit before consenting, the same kind of financial review that AI loan underwriting software automates for lenders sizing a borrower. And once the new tenant is in place, the landlord usually has to collect and track its insurance, which is where a certificate of insurance tracking platform keeps the new tenant's COI current against the lease requirements.

Assignment vs subletting: which is better for a tenant?

It depends on the goal. A tenant that wants to exit a space entirely and is willing to seek a full release prefers an assignment, because a clean assignment plus a release ends its liability. A tenant that wants to keep a foothold, sublet only part of the space, or expects to return prefers a sublease, accepting that it stays liable to the landlord. Tenants negotiating a new lease often push for the right to assign or sublet to an affiliate or in a sale of the business without consent, and for the consent standard to be "not unreasonably withheld," precisely so a future transfer is not blocked.

However the transfer is structured, the lease language controls. Reading the assignment, subletting, consent, change-of-control, and recapture clauses accurately, as amended, is what separates a transfer that closes from one that stalls. For the tool that pulls every one of those clauses into a reviewable abstract, see our lease abstraction software overview.