Structure 5 (also known as Palace 5) is the highest palace structure at Tamarindito. The palace's interior measured and it had a vaulted roof. The interior contained only one or possibly two simple rooms without benches. The structure faced north and a single doorway has been uncovered in that side, although it is possible that a second doorway also existed in the north side. Unusually this meant that the building faced away from Group A's Main Plaza. A wide stairway climbed the structure from the Plaza but it was necessary to walk around to the other side of the structure to gain access. The facade of Structure 5 overlooks Structure 7 immediately to the north. Investigations of the palace have discovered an earlier substructure below a second stucco floor. Structure 5 may be the oldest structure in Group A.