This paper presents a case study on the back-analysis of soil-structure responses as a result of a 3-level basement excavation supported by tied-back contiguous bored pile (CBP) wall as retaining system. Soil-structure interaction is analyzed using Finite Element (FE) code PLAXIS 2D (version 9.0). The analyses are subsequently benchmarked and compared to measured field data to develop further understanding on soil-­structure interaction. Aspects of soil-structure interaction considered are: (a) effect of CBP wall socketed in metamorphic phyllite, hence enabling the possible idealization of modeling the ground water table using the "Z-water table method"; and localized dewatering caused by the installation of the tie-back ground anchor system (b) 3-D corner effect simulated by plain strain ratio and its application to the entire depth of the CBP wall sections instead of being applied to the maximum deflections only and ( c) effect of structural capping beam on the CBP wall head is thought to have provided some form of restraint to the CBP wall.