The Longs Lane Precinct is of prime archaeological significance with its continued European occupation from at least the first quarter of the nineteenth century in a relatively undisturbed state. The Longs Lane Precinct is of educational value to specialists and the general public with its ensemble of nineteenth buildings, laneways and rear yards, and its significance is enhanced by the tangible relationship of the buildings and laneways to the documentary and oral historical information. The archaeological potential of the site of No. 136-138 Cumberland Street is high and relates to early development of The Rocks as well as late nineteenth and early twentieth century development. Any subfloor archaeological deposits are a significant resource. Nos. 136-138 Cumberland Street meets this criterion at a State level.
