A year-end operating-cost reconciliation should be reproducible. Another qualified reviewer should be able to move from the executed lease and amendments to property-level actual costs, approved adjustments, the tenant allocation, payments already billed and the final credit or amount due. The schedule is strongest when contractual, accounting and tax conclusions remain visibly separate.
This is general information, not legal, tax, environmental, engineering, accounting or investment advice. Obtain advice specific to the property and transaction.
1. Freeze the lease and amendment record
Create a complete executed-document set for each tenant. Abstract the relevant definitions, fiscal period, premises area, proportionate share, base year or expense stop, caps, exclusions, gross-up, management, capital recovery, statement timing, review rights and notice requirements.
Use section citations and effective dates. If a renewal, expansion, contraction, assignment or amendment changed the economics during the year, split the calculation into the periods actually governed by each term.
2. Close the property-level source ledger
Reconcile the general ledger to financial statements, invoices, contracts, tax notices, insurance, utility records, payroll allocations and other source documents. Identify accruals, prepayments, credits, rebates, recoveries and prior-year adjustments.
Separate the property, legal entity and accounting period. A multi-property invoice or portfolio allocation should show its allocation basis rather than entering the building ledger as an unexplained amount.
3. Map every account to a lease category
Create a crosswalk from each ledger account to recoverable, non-recoverable, tenant-specific, capital, excluded, disputed or pending categories under the lease. Do not rely on the chart-of-accounts name as the conclusion.
Maintain a rule record for why each account is included or excluded and whether the treatment differs by tenant. This avoids applying one building-wide assumption to leases with different language.
4. Reconcile property tax and assessment events
Trace the annual tax notice, supplementary or amended amounts, local improvement charges, refunds, credits and appeal-related adjustments to the correct period. Distinguish municipal assessment from the tax payable and from the lease recovery.
Calgary and Edmonton publish non-residential assessment information, but the property-specific notice and owner record remain the relevant source. Document how a mid-year change or refund is treated under each lease.
5. Establish the area and share schedule
List each premises area, effective dates, total denominator and any excluded or separately allocated space. Reconcile the schedule to plans, measurement records, leases and amendments.
Where the lease references a measurement standard, identify the exact edition and method. BOMA maintains property-type-specific standards, so an office, industrial and retail area should not be assumed to follow one generic calculation.
6. Apply occupancy and gross-up provisions by category
Identify average or period-specific occupancy and the categories eligible for adjustment. Variable costs may respond differently to occupancy than fixed costs. State the unadjusted actual, formula, assumed occupancy and adjusted result.
Do not gross up a whole statement merely because the building had vacancy. The lease language and cost behaviour should support the particular adjustment.
7. Apply base years, expense stops, caps and floors
Calculate the relevant base amount, cumulative or annual cap, excluded increases, reset, carry-forward and partial-year treatment from the lease. Show the sequence of calculations and do not apply a cap to categories the clause excludes.
Preserve both the property actual and the tenant-recoverable result. A cap changes a tenant calculation; it does not change the underlying property expense.
8. Calculate management and capital recovery separately
State the management or administration rate, its cost base and any minimum or duplicate charge. For permitted capital recovery, identify the project, placed-in-service date, recoverable basis, amortization period, rate, annual amount and allocation.
The schedule should not silently convert an owner project into an operating expense. Counsel and accounting advisors should confirm the lease and financial treatment where material.
9. Reconcile tenant billings, payments and credits
Start with the tenant's final allocated amount, then reconcile monthly estimates, direct billings, adjustments, credits, prior balances and payments. Keep arrears, interest and unrelated charges outside the operating-cost variance unless the statement expressly addresses them.
The final schedule should show property actuals, allocation adjustments, tenant share, amount billed and the resulting credit or amount due in separate columns.
10. Apply GST and issue a supportable statement
CRA treats many additional-rent amounts as consideration for the taxable commercial lease, including an owner-paid property-tax recovery in the circumstances it describes. Other amounts can have different treatment. Confirm registration, supply and invoice requirements with the tax advisor.
Issue the statement, calculation notes, tax disclosure and permitted supporting material through the process and timing required by the lease. Preserve the version delivered, recipient, delivery evidence, questions, corrections and final resolution.
Primary sources
Verify the current rules.
Government and regulator pages can change. These links were reviewed on August 26, 2026.
CRA: Commercial real property — sales and rentals↗CRA: Charge and collect the GST/HST↗Alberta: Municipal property assessment↗City of Calgary: Non-residential property assessments↗City of Edmonton: Non-residential assessment details↗BOMA International: Building measurement standards↗RECA: Real Estate Act Rules↗A real property decision?
Commercially can help position a lease opportunity and organize decision-ready property information. Lease drafting, reconciliation opinions, accounting and tax conclusions remain with the owner's qualified advisors.Who, how and why
Who: Commercially Research & Editorial.
How: Primary-source research and AI-assisted drafting were used to organize this guide around a practical commercial real estate decision. Source links, factual claims and material limitations were checked against Commercially's editorial standards on the review date.
Why: To help owners, buyers and tenants identify the records, questions and professional advice that belong in a real transaction work plan.
Editorial owner: Commercially Research & Editorial.
Commercial review: Slav Loban, Commercial Real Estate Division Leader.
Questions or corrections: hello@commercially.ca
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