After secularization, the property became part of Rancho Santiago de Santa Ana, and the adobe was used as headquarters of Diego Sepulveda. To many, the house is more familiar as the home of Gabe Allen, a colorful character who was a veteran of the Mexican War. From the Allens the Estancia passed to the William L. Adams family for whom Adams Ave. is named. The property was later purchased by members of the Segerstrom family who gave the adobe and its five-acre site to the City of Costa Mesa in 1963. Now restored as a museum, furnishings in each of three rooms reflect a different time period in the Estancia's history. The adobe is California Historical Landmark #227.