Lease due diligence for a property buyer asks a different question than lease review for a tenant. The buyer needs to understand what income and control will transfer with the property, what obligations and disputes will continue after closing, and whether the seller's summaries reconcile to the complete contractual and accounting record.
This is general information, not legal, tax, environmental, engineering, accounting or investment advice. Obtain advice specific to the property and transaction.
1. Create a tenancy document index
For each premises, index the lease, amendments, renewals, assignments, subleases, licences, guarantees, security, side letters, notices, correspondence and litigation or dispute records. Record date, parties, signature status, premises and relationship to prior documents.
Keep a missing-item list and do not assume a landlord's folder is complete. Request written seller confirmation of the provided record and preserve late additions or corrections.
- Tenant and guarantor
- Premises
- Lease and amendments
- Security
- Notices
- Disputes
- Missing documents
2. Confirm parties, premises and term
Match legal tenant and guarantor names to current registry evidence and the entity actually occupying and paying. Reconcile unit numbers, areas, plans, storage, parking, signage, patio, yard, roof, access and other rights to physical occupation.
Abstract commencement, fixturing, rent commencement, expiry, renewal, extension, termination and possession dates. Identify conditions and notice windows rather than recording an option as automatic additional term.
3. Abstract the complete economics
Record base rent, stepped rent, percentage or variable rent, additional rent, expense stops, gross-up, management, taxes, insurance, utilities, capital recovery, audit rights and GST treatment. Tie each item to the operative lease clause.
Track free rent, inducements, tenant improvements, commissions, allowances and outstanding landlord work. Contractual rent is not the same as collected cash or normalized NOI.
4. Review use, exclusivity and operating controls
Identify permitted use, continuous-operation duties, prohibited uses, exclusivity, radius restrictions, co-tenancy, opening conditions, hours, signs, parking, loading and rules affecting the tenant or future leasing.
Counsel should interpret triggers, exceptions, remedies and enforceability. The abstract should cite clauses and flag uncertainty rather than convert complex rights into yes-or-no marketing fields.
5. Map maintenance, repair and capital
Allocate roof, structure, envelope, mechanical, electrical, fire systems, utilities, premises, common areas, paving, snow, landscaping and replacement obligations. Identify casualty, condemnation, restoration and end-of-term removal requirements.
Compare the contractual allocation to building-condition findings and actual maintenance practice. A lease label such as 'net' or 'triple net' does not answer every cost or capital question.
6. Review assignment, subletting and sale provisions
Identify tenant assignment and sublease rights, landlord consent standards, recapture or profit-sharing rights and continuing liability. Review landlord transfer, mortgagee, subordination, attornment, non-disturbance and sale-notice provisions with counsel.
Determine whether rights of first refusal, first offer, purchase options or other transaction rights affect marketing, timing, disclosure or closing. Do not summarize them without clause-level review.
7. Trace defaults, waivers and disputes
Request notices, arrears records, payment plans, defaults, cure correspondence, claims, offsets, abatements, insurance issues and settlement or waiver documents. Compare the seller's disclosure with tenant statements and accounting records.
A current payment does not erase a prior default or continuing dispute. Counsel should determine legal effect; underwriting should preserve the cash, cost and relationship consequences.
8. Verify security and tenant evidence
Review deposits, prepaid rent, letters of credit, guarantees and other security for amount, custody, expiry, draw conditions, replenishment, transfer and current enforceability with counsel. Reconcile each item to the rent roll and closing adjustments.
Corporate searches, financial statements and insolvency records can support tenant review but must be current, entity-matched and interpreted in context. Historical performance cannot guarantee future payment.
9. Reconcile tenant certificates and seller representations
Compare each estoppel or tenant confirmation to the lease index, abstract, billing, collection, deposits, defaults, options and outstanding work. Record unanswered questions, qualifications and inconsistencies.
Coordinate the scope, required signatories, delivery threshold, seller representations, materiality and closing consequences with counsel. A clean certificate does not replace the underlying documents or property review.
10. Produce a counsel-controlled exception report
For each lease, summarize verified terms, source clauses, financial reconciliation, tenant evidence, landlord capital, disputes, missing items and transaction consequences. Separate factual abstraction from legal interpretation and underwriting assumptions.
This guide is educational and is not legal, accounting, tax, privacy, appraisal, financing or investment advice. Commercial lease language and transaction documents control the property-specific result.
Primary sources
Verify the current rules.
Government and regulator pages can change. These links were reviewed on August 26, 2026.
RECA: Commercial real estate practice competency blueprint↗RECA: Property ownership and title-search due diligence↗RECA: Real Estate Act Rules and standards of practice↗Alberta: Find land titles, documents or plans↗Alberta: Find corporation details↗Canada: Bankruptcy and Insolvency Records Search↗Alberta: Personal Information Protection Act↗Alberta: Disclosing personal information↗Alberta: Protecting personal information↗A real property decision?
Send the property, tenancy profile, target return, diligence deadline and missing lease evidence.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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