Which of the following conditions must be met for a fireplace to be included in the finished area?

For a fireplace to be considered part of the finished area of a home, it must extend beyond the exterior finished surface of the walls. This condition ensures that the fireplace is fully integrated into the living space, making it usable and accessible as a feature of the home. The extension beyond the exterior walls signifies that the fireplace is not just an ornamental element but a functional component that contributes to the overall layout and design of the finished area.

In terms of the other options, a gas-powered fireplace, while common, is not a requirement for it to be part of the finished area; various fuel types can be used. The location of the fireplace in the main living area may be advantageous for aesthetics or utility, but it doesn't determine its classification as finished space. Similarly, the construction materials, such as brick, are important for safety and aesthetic purposes but do not exclusively qualify a fireplace as part of the finished area. Thus, the requirement of extending beyond the exterior finished surface is the correct and crucial condition for inclusion in the finished area.