Which of the following activities would not require a real estate license?

Selling your own commercial property does not require a real estate license, which makes it the correct answer. In California, individuals are allowed to sell their own real estate without being licensed. This means that as the owner of a property, you can engage in transactions involving that property, such as advertising and negotiating sales, without needing a real estate license.

In contrast, acting as a property manager for a client, representing a buyer in a residential sale, and buying a home for resale involve activities that typically require a real estate license. These activities are considered professional services that require the licensee to have specific knowledge of the market and to adhere to legal regulations that protect consumers in transactions. Therefore, it is essential for anyone engaging in those services on behalf of clients or for profit to have the proper licensing credentials.