A retained home may be relevant to the overall account of your plans, but property ownership is not a TN requirement or a guarantee of temporary intent. Explain who will live there and what you actually intend at the end of the stay. Professional eligibility and temporary entry must still be established on their own facts.
Answer the question that is actually asked
If asked about plans, describe the work, its period, and where the family will live, in that order. Volunteering a mortgage statement in response to a question about duties changes the subject and suggests the applicant is arguing a point rather than answering. Counsel can advise on how to describe a genuinely open-ended assignment truthfully, which is the harder conversation.
The teacher entry names three kinds of institution and stops there. Compare onboarding tasks with the position after orientation, identify who directs the work, and disclose any ownership. A reviewer at a port of entry has the letter, the credential and a short conversation. TN still requires Canadian or Mexican citizenship, a listed USMCA profession, that profession’s prescribed qualification, and prearranged US professional work without self-employment. A Canadian may generally apply at a port of entry, while a US employer may instead file Form I-129.