La Casa del Marqués de Cilleruelo is at the beginning of Main Street, just before you reach the Plaza Spain. The first person that owned this building was Joaquin de Quevedo y Fernández de Velasco, Knight of Santiago, brigadier of the royal armies and captain of the royal guard Reinosa Infantry in 1778, although it is also known as Casa del Regidor or House Pano, depending on its subsequent owners. It is a noble building of XVII. It has two stories and it was built out of masonry. Its cover is made of an arch that is semicircular between pilasters. This leads leads to a hallway paved with river stones, on it projects a stone balcony and both sides two semicircular balconies (left covered by windows) as pulpit. You will notice three familiar shields on the facade of the building. They are the following: The Marquis of Cilleruelo in the center of Velasco the right, and the left Quevedo.