What is a key feature of an unconditional offer?

An unconditional offer is characterized by the absence of contingencies, meaning that the buyer is making a straightforward proposal to purchase the property without any conditions that must be met. This assurance shows the seller that the buyer is fully committed to the purchase, increasing the likelihood of acceptance.

In contrast, the other options indicate elements that can introduce conditions to the offer. For instance, requiring seller approval involves a level of dependency on the seller's acceptance, financing terms can create contingencies that need to be met for the sale to proceed, and having an expiration date implies a timeframe that introduces a condition for acceptance. Therefore, the defining feature of an unconditional offer is the lack of these additional stipulations, making it a strong and definitive proposal in the real estate market.