When a Commercial Tenant Wants to Assign or Sublease the Premises

At some point during a commercial lease, a tenant may approach the landlord seeking permission to assign the lease or to sublease the premises. These requests are common, but they should not be treated as routine administrative matters. The decision carries long-term financial and legal consequences, and both the lease and the proposed arrangement warrant careful review before consent is given.

Although the terms are frequently used interchangeably, an assignment and a sublease are different things. In an assignment, the tenant transfers its interest in the lease to another party, who generally assumes the tenant's position under it. In a sublease, the original tenant remains responsible under the lease while permitting another business to occupy all or part of the premises for a period. Understanding the distinction matters because it determines who the landlord can pursue if difficulties arise later.

The first step is always to review the lease itself. Most commercial leases contain detailed provisions governing assignments and subleases, including whether the landlord's consent is required and the circumstances in which it may be withheld. Some leases confer broad discretion on the landlord; others require that consent not be unreasonably withheld. Knowing precisely what the lease permits is essential before responding to the request, because a refusal that the lease does not support creates its own exposure.

The proposed new occupant should be evaluated with the same care applied to the original tenant. The fact that the existing tenant has performed well says nothing about its replacement. Conducting due diligence comparable to the original leasing process is generally worthwhile, and financial statements, business history, references, credit information and the nature of the proposed business should each be considered before a decision is made.

The proposed use of the premises requires equal attention. A different business may increase parking demand, create noise concerns, require additional renovations, or affect other tenants in the property. In some cases the proposed use may conflict with exclusive use clauses granted to existing tenants, or raise zoning and regulatory issues that the landlord will ultimately have to resolve.

Where a landlord does agree to an assignment or sublease, appropriate documentation is critical. Consent should always be given in writing and should clearly set out the rights and responsibilities of each party. Depending on the circumstances, a landlord may also wish to require that the original tenant remain liable under the lease, obtain updated guarantees, or require additional security from the incoming tenant.

Assignments and subleases can also present an opportunity. Where market rental rates have increased significantly since the original lease was signed, a landlord may have leverage to negotiate amendments, updated insurance requirements or other changes as part of the consent process, provided the lease permits such discussions.

Above all, landlords should avoid giving informal verbal approval. Casual conversations and ambiguous email exchanges can create real uncertainty about whether consent was granted at all, and that uncertainty tends to surface at the least convenient moment. Following a consistent written process ensures that everyone understands the arrangement and materially reduces the likelihood of a future dispute.

Every request should be assessed on its own facts. The strength of the proposed tenant, the language of the lease and the long-term objectives for the property all bear on the right course of action. Taking the time to evaluate the request properly helps protect the value of the investment for years afterwards.