Final answer:
In Illinois, Broker Bob would need a real estate license to sell Sam's interest in the limited partnership that owns real estate.
Step-by-step explanation:
In Illinois, for Broker Bob to sell Sam's interest in the limited partnership that owns real estate, he would need a real estate license. A real estate license is required to engage in the buying, selling, or leasing of real estate properties. Since Sam owns a portion of the limited partnership that owns real estate, Broker Bob would need a valid real estate license to facilitate the sale.