A massive masonry structure was observed in the stanchion holes dug for Sainsbury's supermarket in Culver Street / Priory Walk. The structure has been discussed as a possible Forum or a building associated with the Temple Precinct to the north.

The structure consisted of at least four very solid east-west walls built of remarkably hard white mortar and septaria, sunk up to 10ft into the ground below foundation level and between five and seven feet in width above the foundation offset. The walls had been robbed out down to their foundation offset, and in some cases were completely absent, represented only by enormous robber trenches. The building was sealed by a layer of burnt daub. There are two conflicting accounts of this buildings archaeology; see Dunnett <1> and Crummy <2>.