What happens to an underlease when a headlease terminates?

For landlords, it preserves an income stream while maintaining privity of contract with the head tenant, who remains liable under the headlease in the event of default by the undertenant. For tenants, it can provide financial flexibility or enable more efficient use of premises. For undertenants, it offers access to prime locations with reduced upfront commitments.

Notwithstanding these benefits, an underlease is inherently derivative in nature: its existence depends upon the continuation of the headlease. Accordingly, the termination of a headlease raises a critical legal question - what becomes of the underlease? The answer depends primarily on the manner in which the headlease comes to an end.

In this article, associate Philip Lardner considers the impact on commercial underleases where the headlease falls away by way of forfeiture, surrender, break, disclaimer or bona vacantia.

Where a headlease is forfeited - most commonly due to breach of covenant (such as non-payment of rent) or insolvency - the general rule is that any subsisting underlease is automatically extinguished. This reflects the principle that a derivative interest cannot survive the termination of the superior estate from which it is carved.

However, statutory protection is available to undertenants. Pursuant to section 146(4) of the Law of Property Act 1925, an undertenant may apply to the court for relief from forfeiture. The court has a broad discretion in such cases and may, for example, grant a new lease directly to the undertenant or vest the headlease interest in them. Relief is not guaranteed and may be subject to conditions, including the payment of arrears or mesne profits (being compensation paid to a landowner where a former occupier remains in occupation following termination or expiry of its tenancy).

A different outcome arises where the headlease is terminated by surrender. In such cases, the underlease will generally continue to subsist. By virtue of section 139 of the Law of Property Act 1925, the superior landlord effectively steps into the position of the immediate landlord, and the undertenant holds the property on the same terms as before.

Nevertheless, certain complexities may arise. For instance, if the surrender is effected in conjunction with the grant of a new lease (amounting to a surrender and re-grant), questions may arise as to whether the underlease is preserved. Similarly, where the terms of the underlease are expressly dependent upon provisions contained in the headlease - such as rent review mechanisms - uncertainty may result if those provisions cease to have operative effect.

The exercise of a break clause in a headlease will typically bring both the headlease and any derivative underlease to an end. This is consistent with the general principle governing derivative interests.

There are, however, important qualifications. Where an underlease benefits from security of tenure under the Landlord and Tenant Act 1954, the undertenant may acquire a statutory tenancy upon termination of the contractual term, thereby preserving a right to apply for a new lease. In addition, the conditions attached to the exercise of a break clause - such as the requirement to provide vacant possession - may necessitate the prior termination of any underleases.

For this reason, landlords commonly require that underleases contain corresponding break provisions, ensuring alignment between the superior and derivative interests.

In the context of insolvency, a liquidator or trustee in bankruptcy may disclaim a headlease as onerous property. Disclaimer operates to terminate the tenant’s interest in the lease but does not automatically extinguish any underlease derived from it.

In such circumstances, the undertenant may remain in occupation, effectively holding the premises subject to the superior landlord’s rights. However, the undertenant will typically be required to comply with the covenants of the headlease - most notably the payment of rent - failing which the landlord may exercise a right of forfeiture.

To safeguard their position, undertenants may apply to the court for a vesting order, which can confer a direct leasehold interest. The grant of such relief is discretionary and will depend on the facts of the case.

Where a tenant company is dissolved, its leasehold interest passes to the crown as bona vacantia. The crown has the right to disclaim such property, producing effects analogous to those arising on insolvency disclaimer.

As with insolvency, the underlease may continue notwithstanding the disclaimer, allowing the undertenant to remain in occupation. However this position is precarious and the undertenant may again need to seek a vesting order to secure a direct legal interest.

Although an underlease is intrinsically linked to the headlease from which it derives, its fate upon termination of the headlease is not uniform. Forfeiture and the exercise of break clauses will ordinarily bring the underlease to an end, whereas surrender may preserve it through statutory intervention. Insolvency and bona vacantia introduce additional complexity, potentially allowing the undertenant to remain in occupation, albeit subject to uncertainty.

Given these varied outcomes, careful consideration of the terms of the headlease - and the circumstances in which it may be terminated - is essential for any party acquiring or granting an underlease and therefore parties are strongly advised to seek legal advice when drafting or agreeing such provisions.

Philip Lardner is an associate in the real estate, planning and construction team. He has experience in acting for retail clients and has advised on a wide range of property transactions including commercial and residential acquisitions and disposals, and landlord & tenant matters. He also has experience in property management.