It covered 26,019.53 acres in what is now San Isidro in the Tijuana Municipality of Baja California, Mexico 14 miles east of Tijuana, and 9 miles west of Tecate along the northern tributaries of the Tijuana River near the United States boundary in Baja California Territory.
[1][2] The property of Rancho San Isidro Ajajolojol, lies at an elevation of 987 feet (301 meters), bounded on the west by the mountains dividing it from Rancho Tijuana.
With his father and his brother Juan Bautista Lopez, Jose Lopez participated in Pio Pico's revolt against Governor Manuel Victoria, opponent of secularizing the missions, in 1831.
[5] Like many ranchos east of San Diego it was attacked by the Kumeyaay in 1837 and abandoned for a time requiring a new grant to be made later.
It was formally granted to Juan Ignacio Lopez on June 11, 1840, as Rancho Toljol.