Which of the following activities does NOT require a broker's license in Texas?

The activity that does not require a broker's license in Texas is when an attorney acts on behalf of a client in a real estate transaction. This exception exists because attorneys are licensed professionals who have the legal authority to represent clients in various legal matters, including real estate transactions. They can give legal advice and negotiate on behalf of their clients without needing a broker's license, as their representation is rooted in their legal expertise.

In contrast, the other activities listed typically require a broker's license because they involve the representation of others in real estate transactions for a fee. For instance, a married couple selling their community property home is engaging in a transaction that could benefit from professional representation, which falls under the purview of licensed agents. Similarly, licensed real estate agents representing buyers need to hold a valid license to facilitate transactions legally. Finally, a broker conducting an open house is promoting a property as part of their licensed activities, thus necessitating a broker's license as well.