San Ysidro

San Ysidro is a district of the City of San Diego, immediately north of the U.S.-Mexico border. It neighbors Otay Mesa West to the north, Otay Mesa to the east, and Nestor and the Tijuana River Valley to the west; together these communities form South San Diego, a practical exclave of the City of San Diego. Major thoroughfares include Beyer Boulevard and San Ysidro Boulevard.

After independence from Spain in 1822, the Mexican government started issuing land grants for ranchos. In 1829 it granted Santiago Argüello Moraga the 10,000-acre Rancho Tía Juana, which covered parts of what now are San Ysidro and Tijuana; his son Emigdio Argüello was granted the adjacent Rancho Melijo in 1833, on which they built "La Punta", an adobe house that was one of the only structures in the area until the late 1800s.

Wikipedia