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Below Grade Garage Walls contribution to Lateral Loads

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I have a two story steel stud shearwall building over a single level, fully subterranean, mildly reinforced parking garage.  Building plan is basically 70 ft. x 200 ft.
Transverse concrete shearwalls have been added at the subterranean parking level.
What is the seismic mass contribution of the perimenter concrete basement walls to the design of the transverse basement walls? The mild reinforced parking deck will be considered in the mass calculations, but subterranean walls, in our opinion, do not contribute to the lateral mass, even of the transverse walls. The design lateral forces of the building result from seismic displacement, but since the displacement of the garage occurs with the seismic displacement, wouldnt the contribution of subterranean mass be negligible?
As an analogy.....If you were to do a COF calculation on slab seismic base shear resistance, it would be similar to multiplying the slab mass times the base shear coefficient prior to the coefficient of friction calculation.  
This is not a seismic soil increment question, just a massing question.
Appreciate the response....

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