What major infrastructure project was initiated in Los Angeles in 1905?

The Owens Valley project refers to the effort initiated in 1905 to bring water from the Owens Valley to Los Angeles, which was a critical infrastructure endeavor for the city's growth and development. This project involved the construction of the aqueduct that would transport water from the eastern Sierra Nevada to the rapidly urbanizing areas of Los Angeles. The availability of this water source allowed Los Angeles to expand its population, support agriculture, and develop industry, fundamentally shaping the region's economy and growth trajectory.

In contrast, the other options are not related to the specific infrastructure project initiated in Los Angeles during that time. The Delta levees pertain to flood control in Northern California, real estate development in the San Fernando Valley came later as a result of various factors including the water availability, and the Hetch Hetchy water project, which provides water to San Francisco, was initiated later and was not a Los Angeles project. The Owens Valley project is distinctively linked to Los Angeles' expansion and its strategic efforts to secure water resources, making it the correct answer.