Executive Summary: Key Legal and Evidentiary Issues

• Enforceability of the April 4, 2025 succession agreement as a binding contract, including offer, acceptance, intention, and consideration.
• Treatment of the $125,000 transfer, joint tenancy in 89 Ottawa Street, and Declaration of Trust as part of the overall consideration supporting the April 4 agreement.
• Alleged unconscionability based on claimed bargaining inequality, emotional vulnerability, lack of independent legal advice, and supposed conflict of interest.
• Reliance on common or mutual mistake regarding CRA/HST arrears, creditor exposure, and the estate trustee’s duties, and whether this vitiated the agreement.
• Justification for specific performance given the practice’s goodwill and history at 89 Ottawa Street, and the inadequacy and uncertainty of damages.
• Necessity of injunctive relief to stop interference with the applicant’s contractual and possessory rights at 89 Ottawa Street.

Facts of the case

Donald Sullivan, a lawyer practising from his home office at 89 Ottawa Street in Arnprior, Ontario, worked closely for about twenty years with Hannah O’Connell, who began as his paralegal in 2006 and became his partner in Sullivan O’Connell LLP after her 2017 call. They jointly built the practice and operated it from 89 Ottawa Street, which was both Sullivan’s residence and the firm’s office. Sullivan’s family viewed O’Connell as family, and she assisted him personally and professionally, including during health crises.

After Sullivan’s wife Sheila died on December 24, 2024, his health declined. His daughters, Stephanie Paquette and Noreen Sullivan, became his caregivers and later Estate Trustees. In January 2025 he opened a joint account with Stephanie to help her pay his bills. Diagnosed with a terminal illness in March 2025, he wrote a $125,000 cheque on March 31, 2025, which Stephanie deposited into their joint account, aware that he feared CRA enforcement because of tax arrears.

On April 2, 2025, at 89 Ottawa Street, Sullivan dictated to O’Connell the terms of a written agreement governing the continuation of the practice and use of the house after his death. She typed as he spoke; they refined minor wording; and he said he would review it with Stephanie before signing. The April 4, 2025 agreement provided that O’Connell would carry on Sullivan O’Connell LLP and assume all its assets (files, equipment, accounts receivable and unbilled work) while fairly attributing income from unfinished files to the estate; move into and reside at 89 Ottawa Street rent-free; pay all overhead and keep the property in good repair; be reimbursed or credited for major estate-approved repairs; and that funds accessible to Stephanie (the $125,000 joint account funds and certain CIBC trust monies) would cover Noreen’s household costs and minimum payments on Donald and Sheila’s credit and tax debts. The agreement also stated that this system would govern for at least three years after Donald’s death and granted O’Connell a first option to purchase 89 Ottawa Street at fair market value within that three-year period.

Parallel to this, Sullivan instructed O’Connell to prepare a transfer adding Stephanie as joint tenant of 89 Ottawa Street and a Declaration of Trust providing that her beneficial interest would vest one hour before his death, to “protect the house” from estate debts and probate. Stephanie signed on April 2; O’Connell registered the transfer on April 3. That day Sullivan told Stephanie by video call there was a document for her to sign at the home office. On April 4, 2025, he met Stephanie and Noreen at 89 Ottawa Street; O’Connell left the room while he explained the agreement. Stephanie read it, said she understood, and then she, Donald and Hannah signed it in the presence of Donald’s brother Bernie (as witness) and Noreen. It was undisputed that Sullivan was lucid and under regular medical care. He died on April 9, 2025.

After his death, O’Connell managed the practice and prepared to move into the house. She learned in late April/early May that the LLP registration had lapsed in 2022 and converted the practice to a sole proprietorship, as Sullivan could not sign renewal documents. By June 2025, relations with Stephanie deteriorated: Stephanie resisted the agreement, tried to change its terms, limited O’Connell’s access to 89 Ottawa Street to business use, and allegedly installed surveillance devices interfering with client confidentiality. Stephanie also highlighted the estate’s financial problems—unfiled HST returns, significant CRA arrears and a CIBC line of credit on the property—and claimed she had not known the full extent of these debts when she signed the agreement.

Legal issues and contract analysis

O’Connell applied to the Ontario Superior Court of Justice seeking, among other relief, a declaration that the April 4, 2025 agreement was valid and enforceable, specific performance, removal of surveillance devices, full access to the practice assets, recognition of her first option to purchase, injunctive relief, and initially a certificate of pending litigation. The court framed the key issues as: (1) whether the April 4 agreement met the requirements of a valid contract; (2) whether it was unenforceable for unconscionability or other equitable reasons, including alleged common or mutual mistake; (3) whether specific performance should be granted; and (4) whether an injunction should issue. Given the outcome, the judge found it unnecessary to decide on a certificate of pending litigation.

On contract formation, the court applied orthodox principles: an offer accepted by the other party, intention to create legal relations, and consideration. Offer, acceptance and intention were straightforward: the agreement was drafted at Sullivan’s direction, explained to his daughters, and voluntarily signed by all parties in the presence of a family witness, using clear, plain language that each understood. The main dispute concerned consideration. The respondents argued that the $125,000 transfer and the joint tenancy/Declaration of Trust, having occurred before April 4, were “past consideration” and unrelated to the agreement, and that Stephanie received no genuine exchange for her concessions regarding possession and the option to purchase.

Justice Holowka rejected this narrow temporal view. He treated the March 31 transfer, the April 2 property conveyance and trust declaration, and the April 4 agreement as parts of a single, integrated succession plan designed both to preserve the practice and to benefit Stephanie. In that integrated context, Stephanie received substantial consideration: beneficial ownership of 89 Ottawa Street, shielded from most estate creditors and free of probate fees; access to the $125,000 and related funds for family and debt payments; and continuity of a law practice that supported the property’s value. At the same time, O’Connell assumed obligations that benefited the estate and Stephanie, including paying all overhead, maintaining the property, and fairly allocating income from unfinished files. The court held that these elements satisfied the requirement for consideration, making the April 4 agreement a valid, enforceable contract.

Equitable challenges: unconscionability and mistake

The respondents urged the court not to enforce the agreement on equitable grounds. Invoking the doctrine of unconscionability from Uber Technologies Inc. v. Heller, they claimed inequality of bargaining power and an improvident transaction, pointing to Stephanie’s emotional vulnerability, lack of independent legal advice, O’Connell’s superior legal knowledge, and the estate’s creditor exposure. They also advanced a common or mutual mistake theory based on incomplete understanding of Sullivan’s CRA/HST arrears and the impact on creditor priorities and estate administration.

On inequality, the court found no evidence that Stephanie was so dependent or desperate that she had no real choice, and no evidence of threats or pressure. The contract was short and in plain English, and Stephanie read and understood it. While the context was emotionally charged, the judge found that it did not impair her ability to make decisions in her own interest. The absence of independent legal advice weighed against the agreement but was not decisive, particularly because Sullivan, not O’Connell, drafted and explained it, and O’Connell was not present when it was presented and signed. The court also rejected the conflict-of-interest argument: although O’Connell prepared the transfer and trust documents, she did so on Sullivan’s instructions, did not advise Stephanie about the April 4 agreement, and Stephanie did not regard her as her lawyer in that transaction.

On improvidence, the respondents argued the agreement effectively locked up the estate’s principal asset, the house, and hindered creditor payments. The court again adopted a holistic view: Stephanie had received $125,000, beneficial ownership of the property, and a structure that preserved the practice and the property’s value, while O’Connell bore expenses and risks. Those features meant the transaction was not unduly one-sided or exploitative. As for mistake, the judge found that Sullivan knew about his tax arrears and deliberately structured the property transfer to protect the house; both Stephanie and O’Connell knew there were CRA issues, even if they lacked precise figures; and the agreement itself expressly referred to arrears and specified that the $125,000 and other funds would be used toward minimum payments. This incomplete knowledge of the exact amounts did not qualify as a fundamental common or mutual mistake nullifying the agreement. The court concluded that the agreement was neither unconscionable nor inequitable.

Remedies and final outcome

Having found the agreement valid and enforceable, the court considered remedy. O’Connell argued that only specific performance would adequately protect the goodwill and continuity of the practice tied to 89 Ottawa Street, and that damages would be hard to quantify and difficult to collect. The respondents contended that the property was replaceable and that monetary compensation was sufficient.

Justice Holowka held that specific performance was appropriate. Although 89 Ottawa Street was not physically unique, it was unique in its connection to the long-standing Sullivan-O’Connell practice and its client base. Relocation would likely cause significant disruption and loss of goodwill, which would be difficult to translate into a reliable damages figure, especially in light of doubts about the estate’s ability to pay. Specific performance also honoured Sullivan’s clear intention that his legal legacy continue at that address and preserved the status quo.

Because Stephanie had already interfered with O’Connell’s use of the premises, the court also granted a limited injunction to give practical effect to specific performance. The final orders granted specific performance of the April 4, 2025 agreement; allowed O’Connell to move into and have unhindered access to all parts of 89 Ottawa Street; required removal of all cameras and listening devices from the property; confirmed her unhindered access to all assets of Sullivan O’Connell LLP; recognized her right to exercise the first option to purchase the property at fair market value at any time within three years after she moves in; and enjoined Stephanie from interfering with these rights, while preserving her rights comparable to those of a residential landlord. The successful party is the applicant, Hannah O’Connell. The court did not award damages and did not fix any specific costs amount, instead directing the parties to attempt to agree on costs or proceed by brief written submissions, so the total monetary recovery in her favour cannot be determined from this decision alone.