A Commercial Sublease Agreement is a contract between an existing commercial tenant (the sublessor) and a new occupant (the sublessee) that grants the sublessee the right to use all or a portion of the leased commercial space for the remainder of the original lease term or a shorter period. The sublessor remains bound by the original lease with the landlord and assumes liability for the sublessee's performance, creating a layered contractual structure where the sublessee's obligations flow through the sublessor to the property owner.

Commercial subleasing is governed by the terms of the original lease agreement and applicable state landlord-tenant law. Most commercial leases require the landlord's written consent before subleasing, and under the Restatement (Second) of Property (Landlord and Tenant) Section 15.2, a landlord's consent clause is generally enforceable. However, several states including California (Civil Code Section 1995.260) and New York have enacted statutes providing that landlords cannot unreasonably withhold consent to a commercial sublease, even when the lease contains an absolute prohibition on subleasing. The distinction between a sublease and an assignment is legally significant: in a sublease, the original tenant retains a reversionary interest and remains in privity of estate with the landlord, while an assignment transfers the entire remaining lease term.

Commercial subleasing has become increasingly common as businesses downsize, relocate, or pivot to hybrid work models, leaving excess office, retail, or industrial space. The sublease provides the original tenant with rental income to offset their lease obligations while giving the sublessee access to commercial space, often at below-market rates, without the long-term commitment of a direct lease.

A commercial sublease agreement is needed when a business tenant has excess space they want to rent to another business while maintaining their existing lease obligations. Companies that have downsized or adopted remote work policies often sublease unused portions of their office space, whether individual offices, entire floors, or conference rooms, to reduce their net occupancy costs. Startups and small businesses benefit from subleasing because they can access premium commercial locations at negotiated rates without qualifying for a direct lease from the landlord.

Retail tenants who want to share storefront space with complementary businesses, such as a clothing boutique subleasing a section to a jewelry vendor, need sublease agreements that address shared common areas, signage rights, operating hours, and customer access. Warehouse and industrial tenants with excess storage or production capacity sublease portions of their facilities to other businesses, requiring agreements that address shared loading docks, parking allocations, utility metering, and environmental compliance responsibilities.

Co-working arrangements where a primary tenant creates shared workspace for multiple sublessee businesses require sublease agreements tailored to flexible occupancy, specifying included amenities, access hours, guest policies, and the distinction between dedicated and shared spaces. Businesses undergoing lease buyout negotiations with landlords may sublease their space during the transition period to mitigate losses, and the sublease agreement must address the early termination contingency.

The premises description must precisely identify the subleased space, including floor plans with highlighted areas, square footage calculations (distinguishing between usable and rentable square footage using BOMA measurement standards), and any shared or common areas included in the sublease. Reference the original lease by date and parties, and attach a copy as an exhibit. Include a representation that the sublessor has obtained the landlord's written consent to sublease, as a sublease executed without required landlord consent may be voidable and could constitute a default under the original lease.

Rent provisions should specify the sublease rent amount, payment due dates, grace periods, and late payment penalties. Address whether the sublessee pays rent directly to the sublessor or to the landlord, and clarify responsibility for operating expense escalations, CAM (common area maintenance) charges, property tax pass-throughs, and utility costs. Many commercial subleases include rent that is lower than the sublessor's obligation under the original lease, but the agreement should address profit-sharing requirements if the original lease contains a recapture clause entitling the landlord to excess sublease profits.

The sublease must incorporate the relevant terms of the original lease by reference, including use restrictions, insurance requirements, maintenance obligations, alteration approval processes, and default remedies. Specify which original lease obligations the sublessee assumes directly versus those retained by the sublessor. Address the sublessee's obligation to surrender the premises in the condition required by the original lease, including removal of improvements and restoration requirements. Include provisions for landlord access rights, subordination to the original lease terms, and the consequences of original lease termination on the sublease, whether through default, expiration, or early termination by the landlord. Liability and indemnification provisions should clearly allocate responsibility for injuries, property damage, and environmental contamination occurring in the subleased space.