An open air narrow passage linked the Central Court with the North Entrance. It was paved and had a strong inclination towards the north. Right and left were two raised colonnades known as "Bastions".
Arthur Evans reconstructed the "Bastion" on the west side. He also placed a copy of a restored relief fresco of a bull here. The wall painting may have formed part of hunting scene.
The passage ends in a large hall with ten square pillars and two columns. The pillars and columns probably supported a large hall on the upper floor. Evans suggested that, due to its position on the seaward side, it was here that the produce of seaborne trade would have been checked when it reached the Palace. It was therefore named the "Customs House".