The palace measures on the ground-floor 265 feet in frontage and 120 feet in depth. The second storey was 220 feet long and 60 feet deep. The third storey is 150 feet long and 18 feet deep. The general design of the façades, those of the lower two having been columnar, as seen clearly in the second, was identical. The façade of the upper terrace was plain. The entablatures of the first and second were elaborately decorated with carvings, among which the most remarkable is the figure of a man supporting himself on his hands with his legs bent wide apart at right angles to his body in an attitude which certainly cannot be said to err on the side of delicacy. The building is to the rear much what it is in the front, though the platforms of the back terraces are narrower. The rooms vary in length from 23 feet to 10. In the second range to the northward there were ten doorways sealed up with masonry like those we had earlier found in the Nunnery building at Chichen. Stephens in 1842 broke into these and discovered that there were ten rooms, 220 feet long altogether, each 10 feet deep, filled with solid masses of mortar and stone. The most extraordinary fact disclosed by him is that the filling up of the rooms must have been done in the course of the erection of the building; for as the stone fillings rose above the top of the doorways the workmen could not have entered the apartments through the doors to complete the work of filling in. The only way of explaining the means by which these rooms could have been thus made solid is to assume that the work was done from the top before the ceilings of the rooms were superimposed. Stephens is at a loss to explain this feature of the building, for, as he says, if the filling up of these ten rooms was necessary to strengthen the supports of the third terrace, "it would seem to have been much easier to erect a solid structure at once, without any division into apartments." We think he missed the simplest explanation of all. It is quite possible that the palace as first designed was to be two-storeyed. Indeed this is most probable, as this marvellous palace at Sayil is one of the few Mayan buildings which have three habitable storeys. When the building operations had reached the second terrace the cacique, impressed with the grandeur of his work, determined to give the building the added glory of a third storey. But the master architect had his doubts as to whether the foundation work would bear this added weight, and to guard against any "settling" stayed the completion of the rooms in the rear and filled up these ten before the roofs were put on. Surely this is a very natural and very simple explanation of what is otherwise inexplicable.