Subleasing Part of Your Commercial Space: Questions Before You Divide It
An unused room can produce revenue, but a partial sublease works only if the second business can occupy it lawfully, function without disrupting yours and pay enough to justify the new costs. Your own rent does not automatically fall because someone agrees to share the premises. Start with the head lease, the proposed operations and the physical arrangement—not a line drawn through the floor plan.
The main risk is a mismatch: you remain responsible to the building owner while promising a subtenant access, services or a term that you cannot reliably provide. Solve that mismatch before spending money on partitions or advertising an opening date.
Consent and release are different things
Read the head lease and its amendments for partial subletting, permitted use, consent, alterations, shared services, fees and any landlord recapture or termination rights. The consent package should describe the actual occupant and activity. A quiet consulting practice and a customer-facing operation with evening appointments may make very different demands on the same room.
A useful historical illustration is the February 2015 Thompson Creek/ProNAi sublease at 885 West Georgia Street in Vancouver. It concerned part of a larger floor and addressed improvements, extra services and head-landlord consent separately. Its consent expressly did not release the head tenant's obligations. That is evidence of how one negotiated agreement allocated responsibility, not a rule prescribing every BC sublease. Filed Vancouver sublease, sections 7, 11 and 29.
Have the proposed sublease and consent reviewed together with the complete head lease. Incorporating a document by reference is not a substitute for giving the incoming business the terms it must follow. If the real plan is to transfer the whole tenancy with a business sale, our guide to commercial lease assignment addresses that different transaction.
Walk through an ordinary day with both businesses operating
Test a real operating sequence: the subtenant arrives before your staff, receives a client, uses the washroom, accepts a delivery and leaves after your closing time. Which doors must remain accessible? Who can set the alarm? Can someone reach the exit without passing through a locked office or sensitive work area?
Then test the exceptions: a weekend appointment, a power interruption, a courier with a large package and an emergency while your reception is unattended. Record the proposed solution for each. “Shared access” is too vague if one business needs security and the other needs unrestricted customer circulation.
Dividing a commercial space may require permits and building changes. Vancouver lists tenant improvements, moving interior walls and changing commercial land use among work generally requiring a permit. Do not assume a non-load-bearing partition is automatically exempt. City of Vancouver permit guidance.
Ask the municipality and appropriate designer to assess the actual layout and uses, including exit arrangements, fire separations, washrooms, accessibility and building services as applicable. Vancouver also requires an occupancy permit before occupying commercial spaces in circumstances including new space, major renovations or a changed proposed use. Confirm requirements for this project before promising possession. A landlord-approved sketch is not that approval. Vancouver occupancy requirements.
Allocate bills without confusing reimbursement with responsibility
Use this table as a discussion sheet. Replace each proposed allocation with the actual contract language and bill calculation; a percentage of floor area is not automatically fair for every service.
| Item | Obligation to check in head lease | Allocation to settle with subtenant |
|---|---|---|
| Base and additional rent | What the head tenant must pay and when | Fixed subrent, recoveries, adjustments and payment dates |
| Electricity and HVAC | Metering, standard hours, after-hours charges | Separate meter, agreed share or measured charge; equipment and hours covered |
| Internet, reception and cleaning | What is included or separately supplied | Service level, limits, added staff time and cost changes |
| Alterations and permits | Required approvals and responsibility for work | Who pays upfront, handles overruns and owns improvements |
| Damage, insurance and repairs | Head-tenant obligations and insurance requirements | Each party's coverage, reporting, repair and reimbursement obligations |
| Exit and restoration | What must be removed or reinstated | Subtenant work to remove, inspection timing and cost recovery |
The head tenant should not budget a reimbursement as though the underlying obligation has disappeared. A subtenant's late payment can leave you paying the building owner on time while chasing recovery separately. Equally, the subtenant needs to know what evidence supports variable charges and whether it can obtain a reconciliation.
Model vacancy before counting the rent as savings
Consider a hypothetical head tenant paying $6,000 monthly base rent plus $2,000 in additional rent. The proposed subtenant will pay $2,500 plus $700 in agreed recoveries. Extra cleaning and shared-service costs are assumed to be $300 in each occupied month and zero while vacant. All amounts are invented for this example, before taxes, financing and any business-income effects.
Once occupied, the monthly benefit is $3,200 collected minus $300 added cost, or $2,900. The head tenant's net premises outflow becomes $8,000 − $2,900 = $5,100. It is not $4,800, because the extra services also consume cash.
Suppose division work costs $24,000 and legal, permit and design costs total another $6,000. That $30,000 setup cost is paid upfront. If finding a suitable subtenant and completing the work leaves the space vacant for the first three months, the first-year comparison is:
| First-year cash item | No sublease | Three vacant months, then nine occupied |
|---|---|---|
| Head-lease payments: 12 × $8,000 | $96,000 | $96,000 |
| Setup costs | $0 | $30,000 |
| Added occupied-month services | $0 | $2,700 |
| Subtenant receipts | $0 | −$28,800 |
| Net premises cash outflow | $96,000 | $99,900 |
Despite a useful ongoing offset, the first year uses $3,900 more cash than leaving the room unused. During each initial vacant month, the full $8,000 head-lease payment still comes due. The model assumes every later payment is collected and no additional default, brokerage or restoration cost; add those where relevant.
For your own numbers, calculate annual head payments + setup + added costs − collected subrent and recoveries. Compare that with annual head payments alone. Keep deposits separate from earned rent and do not assume they are available to fund construction. Test a longer vacancy and a lower achievable subrent before committing to the work.
Give the arrangement an ending that can work
Align possession and expiry with the rights available under the head lease. Ask what happens if the head tenant defaults, the head lease terminates or the subtenant needs to leave early. Do not promise automatic recognition by the building owner without an agreement supporting it.
Set out the practical handback: keys and access codes, equipment removal, repairs, shared data or telephone services, final utility allocation and any restoration inspection. For a shared workplace, the last month can be as operationally demanding as the first.
Before offering the room, assemble the proposed use, an access-and-services plan, the relevant lease documents and the vacancy cash comparison. If either the layout or the economics fails that test, the unused area is not yet a dependable source of savings.
Commercial leasing information checked September 8, 2026. The financial example is hypothetical; lease terms and municipal requirements must be checked for the particular premises and uses.
When evaluating premises for a partial sublease, JQ Properties can help organize the landlord and property questions around the proposed layout, remaining term and vacancy budget.
By Justin Qiao, Personal Real Estate Corporation, Justin Qiao Group | RE/MAX Crest Realty.
Sources checked September 9, 2026.
