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Four Level building (two basements)

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Im involved  in a preliminar steel design for a four Level Building : Two parking garage basements ( concrete wall in the whole perimeter) and two office stores.
For  Seismic Analysis should the bulding be idealized as a two level bulding considering BASE concept  in UBC " BASE  is the level at which the earthquake are considered to be imparted to the structure ..."
Modeling the building in ETABS with the two basements and the two office stores should I consider for seismic forces just the Weight over the upper basement ?
Thank you