Definition
An under tenant is a person who holds an interest in real property not from the original landlord, but from a tenant — that is, from someone who is themselves already bound by a lease. The under tenant's right to occupy derives from an underlease (also called a sublease), which the original tenant (the mesne tenant) grants out of their own leasehold interest. The under tenant stands one step removed from the landlord in the chain of tenure: the landlord holds the freehold or superior interest, the original tenant holds under the landlord, and the under tenant holds under the original tenant.
Critically, the under tenant has no direct contractual relationship with the original landlord. Rights and obligations run through the mesne tenant. If the original lease is forfeited, surrendered, or terminated, the underlease generally falls with it, and the under tenant's possession becomes vulnerable — a consequence that distinguishes the under tenant's position sharply from that of an assignee, who steps fully into the original tenant's shoes and acquires privity of contract with the landlord.
Common Confusion
UNDER TENANT vs. ASSIGNEE: These terms are frequently conflated but describe legally distinct relationships. An assignee receives a transfer of the entire remaining leasehold interest and stands in direct privity with the landlord. An under tenant receives only a derivative interest carved out of the original tenant's term — typically for a shorter period or on different terms — and has no privity with the superior landlord. The distinction matters most when the head lease is terminated: the assignee's interest rises or falls as part of the head lease itself, while the under tenant holds a separate, subordinate estate that may simply disappear.
UNDER TENANT vs. LICENSEE: An under tenant holds a recognized property interest in the leased premises. A licensee holds only a personal permission to use, which creates no estate and offers far weaker protection.
Why It Matters in Research
The under tenant concept sits at the intersection of landlord-tenant law, property conveyancing, and foreclosure doctrine, which means researchers may encounter it across multiple bodies of law and must track how each treats the subordinate holder.
Vulnerability upon termination of the head lease is the central research problem. Historical sources treat this vulnerability as near-absolute: if the original tenant's lease ends, the under tenant has no recourse against the superior landlord and no right to remain. Modern statutory intervention — most notably the federal Protecting Tenants at Foreclosure Act (PTFA) — has altered this picture in the specific context of foreclosure, requiring successors in interest to honor certain residential tenancies. Researchers working on post-2009 materials must therefore distinguish between scenarios involving lease forfeiture or surrender (generally still governed by common law principles) and scenarios involving foreclosure (where federal and state statutory protections may apply).
In older English and American sources, "under tenant" and "subtenant" are used interchangeably. Modern American practice has largely settled on "subtenant" or "sublessee," so researchers searching historical corpora should use both forms. Burrill's cross-reference to "Underlease" is the most productive secondary path in historical dictionary research.
Pay attention to lease covenants against assignment or subletting. Because the under tenant's interest depends entirely on the validity of the underlease, a sublease granted in violation of a no-subletting covenant may leave the under tenant exposed even before any foreclosure or forfeiture event. This issue appears frequently in landlord-tenant litigation and in treatise discussions of covenant running.
Jurisdictional law on whether a landlord may "accept" an under tenant and thereby create an independent relationship (sometimes called attornment) varies considerably. Researchers should not assume the common law rule of strict privity holds uniformly in modern decisions.
Historical Dictionary Support
Bouvier and Burrill are in precise agreement: both define the under tenant solely by reference to the source of the tenancy (a lessee, not the original landlord) and to the instrument creating it (an underlease). Neither dictionary elaborates on the consequences of termination of the head lease, the effect of covenant violations, or the rights of the under tenant against superior landlords — gaps that are significant for modern research. Both treat the term as derivative, pointing researchers back to the underlease relationship as the foundational concept. Burrill's explicit cross-reference to "Underlease" signals that historical dictionary users should follow that path for doctrinal depth.
Neither source addresses statutory modification of the under tenant's position, which is expected given their period of compilation, but which requires researchers using these dictionaries as starting points to supplement heavily with modern materials.
Jurisdictional Note
American states vary in whether courts will recognize equitable or statutory relief for under tenants when the head lease is terminated through no fault of the under tenant. Some jurisdictions have enacted specific sublessee protection statutes. Federal law addresses the narrower case of residential tenants (including subtenants) when foreclosure terminates the superior interest; state law governs all other scenarios.
Encyclopedia Cross-Reference
Landlord-Tenant — Tenant's Rights Upon Foreclosure (Protecting Tenants at Foreclosure Act) (The Law Mind Property Law Encyclopedia)
Landlord-Tenant — Tenant's Duty to Pay Rent (The Law Mind Property Law Encyclopedia)
Landlord-Tenant — Constructive Eviction (The Law Mind Property Law Encyclopedia)