The building was constructed in the early 18th century, planned as early as 1722 and completed in 1849. It was The keystone above the front entrance is marked with the coat-of-arms of Spanish KingFerdinand VI and the date 1749. The building was the residence and working offices of the local presidio captain at first. Later, it became the home of the Spanish governors who lived in San Antonio.  The building later became the capitol building of the Tejas region of Spanish Texas in 1722.