Can a Marvin/nonmarital cohabitation agreement protect one partner’s business interests?

Yes, a nonmarital cohabitation agreement can protect one partner’s business interests by specifying the status and how the business will be treated in the event of separation or the termination of the relationship.

Keep in mind that depending on the terms of the Marvin/nonmarital cohabitation agreement, it can be agreed that the terms of the Marvin Agreement can be enforceable in the event the parties marry (as if it is a Premarital Agreement).