[1] The building was originally built for the Antonio José Álvarez de Abreu, 1st Marquess of Regalía in 1745.

It was purchased by María de la Concepción Valenzuela, Marchioness of Sonora—third wife[2] of the 18th-century statesman, José de Gálvez, 1st Marquess of Sonora—who commissioned the reconstruction and extension of the palace by the architect, Evaristo del Castillo.

[4] It's current form is built of granite, red brick and Colmenar stone.

It consists of three floors with a lobby and a large branching staircase and a main courtyard.

It was recorded on the Spanish heritage register, Bien de Interés Cultural on 31 July 1995.