In country with high population intensity, there is no distance between buildings. New buildings need excavation. As excavation proceeds, the surrounding soils will move toward the excavation and that may cause damage of adjacent buildings. The present study mainly aims to provide remarks for the design of excavation for sandy and clayey soils in order to prevent damage of adjacent buildings. This paper investigates effect of nearby excavation on adjacent strap footings and studies the interaction behavior between supporting excavation piles and adjacent existing strap footing. The strap footing is used to connect an eccentrically loaded column footing close to the property line to an interior column. Contiguous pile wall is selected to support the excavation on the adjacent buildings sides. Commercial program PLAXIS 2D is used in the numerical analysis. A parametric study was performed to study the effect of strap stiffness, pile diameter, and pile length.