No. The core showing stays the same: treaty citizenship, at least fifty percent treaty ownership, substantial capital genuinely committed and at risk, a real operating enterprise that is not marginal, and your genuine development and direction of it. A guarantee changes who bears default risk, not which eligibility elements you must prove.
Decide who signs before the lease is executed
The practical decision is whether your spouse signs, whether a larger deposit or a letter of credit substitutes, and whether liability ends when the term ends. Ask the commercial lawyer to compare those options in writing, then bring the chosen structure to the immigration review so the money committed to this United States enterprise can be described accurately. In a hypothetical Saint-Amable household, a smaller guarantee with a larger cash deposit changed the risk narrative but not the eligibility test.
The enterprise generally must be at least 50% owned by nationals of the relevant treaty country; the applicant’s passport alone does not establish enterprise nationality. Treaty nationality and the ability to develop and direct—ordinarily through half ownership or operational control—remain separate requirements. Marilou's citizenship is not in question; the company's is, because the handshake leaves treaty nationals holding a minority.