Case Summary

In Diamond Dun-Properties Ltd v Zhao, 2026 ABCA 307, the Alberta Court of Appeal considered an important question for landlords, lenders, and anyone relying on personal guarantees: Can a creditor enforce a guarantee against an individual when both the guarantee and the lawyer's certificate appear valid on their face, but the guarantee was fraudulently obtained?

The Court's answer was no.

The Facts

Diamond-Dun leased commercial property to a corporate tenant. As part of the leasing arrangements, three individuals, including Yinan Zhao, were required to provide personal guarantees.

The landlord received what appeared to be a properly executed guarantee along with a certificate issued under Alberta's Guarantees Acknowledgement Act. On its face, everything looked legitimate.

Years later, after the tenant defaulted, Diamond-Dun sued on the guarantee.

Zhao denied ever signing the guarantee. He swore evidence that he never attended before the lawyer, never signed the guarantee, and never signed the acknowledgment certificate. According to the evidence, another director of the tenant orchestrated an impersonation scheme. Zhao's driver's licence was supplied to a third party, who attended before the lawyer pretending to be Zhao and forged Zhao's signature on both the guarantee and the statutory certificate.

The primary wrongdoer later admitted what had occurred. The chambers judge found as fact that Zhao had no knowledge of the fraud, did not participate in it, and received no personal benefit from it.

The Issue

The landlord argued that section 5 of the Guarantees Acknowledgement Act made the certificate "conclusive proof" that the statutory requirements had been satisfied.

In other words, because the certificate appeared regular on its face and had been relied upon in good faith, the landlord argued the Court was bound to enforce the guarantee regardless of what actually happened.

The Decision

The Alberta Court of Appeal dismissed the appeal.

The Court acknowledged that the Guarantees Acknowledgement Act serves an important commercial purpose. It protects creditors by providing certainty and allows them to rely on properly completed certificates without having to prove every detail of execution years later.

However, the Court drew a critical distinction by noting that the statutory certificate may conclusively prove compliance with the Act, but it does not transform a forged document into a valid obligation.

The Court held that where both the guarantee and the certificate themselves are proven forgeries, and the purported guarantor was entirely innocent of the fraud, the guarantee remains a nullity at common law.

The Court confirmed that section 5 of the Guarantees Acknowledgement Act does not impose automatic liability on an innocent individual whose signature was forged simply because a certificate appears valid on its face.

Why This Matters

This decision is significant because it clarifies the limits of statutory reliance under Alberta's Guarantees Acknowledgement Act.

Many businesspeople assume that once a lawyer's certificate is attached to a guarantee, the matter is effectively bulletproof. The Court confirmed that the certificate remains powerful evidence and will establish liability in most cases. But it is not an absolute shield against fraud.

Where a creditor can show only that the paperwork looked valid, but the evidence later proves the guarantee itself was forged, the statutory certificate will not rescue the transaction.

Key Takeaways for Business

1. A facially valid guarantee is not always enforceable

The Court reaffirmed a basic principle of contract law: a forged document is generally a legal nullity. Even strong statutory language will not necessarily override that principle in cases of proven fraud.

2. The Guarantees Acknowledgement Act is not absolute protection

The Act promotes certainty in commercial transactions and protects both creditors and guarantors. However, the Court confirmed it was never intended to impose liability on someone who never entered into the obligation in the first place.

3. Identity verification matters

The facts of this case arose because an impersonator successfully attended before a lawyer using another person's identification. Businesses, lenders, landlords, and legal professionals should view this decision as a reminder that identity verification protocols remain critically important.

The application of these principles will depend on the particular facts of each case and should be considered with legal advisers at an early stage. Please consult with any member of our team on this or other commercial litigation issues.