Which sector is at least partially responsible for the current size of the real estate sector in Arizona?

The Central Arizona Project plays a crucial role in shaping the size of the real estate sector in Arizona due to its contribution to the availability of water resources in the region. Established to transport Colorado River water to central and southern Arizona, the project has facilitated significant urban and suburban development by providing a reliable water supply necessary for residential growth, agriculture, and economic development.

This influx of water supports not only the agricultural sector but also encourages more people and businesses to move to Arizona, as reliable water resources are essential for infrastructure and living standards. Consequently, increased water availability has led to an expansion in the housing market and real estate development, making it easier to sustain burgeoning populations and new construction projects.

In contrast, while the other options—agriculture, mining, and tourism—are important sectors within Arizona's economy, they do not have the same direct impact on the real estate sector's growth as the Central Arizona Project does through its provisions of essential water resources. Agriculture indeed influences land use but often competes for water resources; mining is less related to residential or commercial real estate growth, and tourism, while beneficial, does not drive real estate development in the same systemic way as a stable water supply does.