Sublease

A sublease is when a tenant ("sublessor") rents out all or part of its leased premises to a third party ("subtenant") for some or all of the remaining lease term, while still remaining the primary tenant under the original ("prime") lease. The sublessor stays on the hook to the landlord for everything in the prime lease; the subtenant is responsible to the sublessor.

This is structurally different from an assignment, where the original tenant transfers all of its rights and obligations to a third party and walks away (subject to the landlord's consent and any continuing guarantee).

Why tenants sublease

Three common drivers:

The first is excess space. A growing company that took five floors planning for headcount expansion finds itself with a half-empty floor; subleasing recovers some of the unused rent.

The second is a change in strategy mid-lease — closing an office, downsizing, or shifting to remote — where the tenant cannot terminate but wants to recover cash flow.

The third is arbitrage. If market rent has risen above the prime lease's contractual rent, a tenant can sublease at the higher market rate and pocket the spread. This is more relevant in long-term leases signed during weak markets.

What the prime lease usually requires

Almost every commercial lease restricts subletting to some extent. The four common shapes:

Absolute prohibition is rare and only appears in retail or specialised single-tenant deals. In office, a flat ban is a red flag.

Landlord consent required, not unreasonably withheld is the most common form. The lease specifies that the tenant may sublease only with the landlord's written consent, but the landlord cannot withhold consent unreasonably. What counts as "reasonable" is defined elsewhere — usually by reference to the subtenant's financial standing, intended use, and reputation.

Recapture rights allow the landlord to take back the space (and terminate the relevant portion of the lease) instead of approving the sublease. This is landlord-favourable; if rents have risen, the landlord captures the upside instead of the tenant. Tenants should negotiate to limit recapture to subleases of more than a certain percentage of the premises (e.g., 50%) or for more than a certain duration.

Profit-sharing lets the landlord take 50% to 100% of any rent the sublessor receives in excess of the prime lease rent. This is the standard fix for the arbitrage scenario above. Negotiate it down to 50% with deductions for the sublessor's transaction costs (broker commissions, legal, free rent given to subtenant, fit-out contributions).

What the sublessor remains liable for

This is the structural feature subtenants and sublessors both need to internalise. The sublessor is fully liable to the prime landlord for everything the prime lease requires — base rent, operating expenses, restoration obligations, indemnification — regardless of whether the subtenant pays the sublessor. If the subtenant defaults, the sublessor must still pay the prime landlord.

This is why subleasing does not actually transfer risk — it adds a counterparty (the subtenant) without removing the original counterparty obligation. A sublessor wanting clean exit should ask for an assignment with a release of the original tenant, not a sublease.

Subtenant protections to negotiate

A subtenant taking space under a sublease faces a structural risk: if the prime lease is terminated for any reason (sublessor default, mutual termination, lender foreclosure), the sublease may also fall. The subtenant has paid for fit-out and is now exposed.

Three protections to ask for:

Recognition agreement from the prime landlord — a written statement that if the prime lease terminates, the landlord will recognise the subtenant as a direct tenant on agreed terms. This is the equivalent of a non-disturbance agreement for subleases.

Right to direct payment: the subtenant pays the prime landlord directly, with the sublessor stepping out of the cash flow. Some landlords accept this, especially when the sublessor's credit is weak.

Diligence on the prime lease: read the prime lease carefully before signing the sublease. The sublease is functionally subject to every term of the prime lease, including termination triggers, restoration obligations, and option rights. The subtenant cannot have rights the sublessor does not have.

APAC norms

In Hong Kong, subletting in office leases is typically permitted with landlord consent and often with profit-sharing on excess rent. Recapture is common in tight markets where landlords have alternative tenants lined up.

Singapore office practice resembles Hong Kong, with one nuance: HDB-controlled commercial space (less common in CBD office) has stricter sublet restrictions tied to use category.

In Japan, subletting (転貸借 tenshakushaku) is generally prohibited or heavily restricted in residential and many older commercial leases. International-grade Tokyo office leases now permit subletting more often, but landlord consent is universally required and recapture is the dominant landlord remedy.

If you are working through a portfolio of subleased space and need each prime lease's restriction, profit-share, and recapture mechanics extracted with citations, LeaseTrace handles that field set per lease.