torsional irregularity and eccentricity checks for structure with basement wall

hello everyone, I'm making a torsional irregularity and eccentricity checks in a building with retaining-basement walls, when I model these walls, which are existed on the basement floor and ground floor, the building will have extreme torsional irregularity and eccentricity of more than 15% (actual 44% in the y direction), how to make these walls not affect the center of rigidity in the model without changing stiffness modifiers of these walls because I think that changing stiffness modifiers will not represent the actual behavior in real life (the walls will have a stiffness).