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This study lays emphasis on the development of efficient analytical models for a multistorystructure with wings, including the in-plane deformation of floor slabs. For this purpose, a multistorystructure with wings is regarded as the combination of multistory structures with rectangular plan andtheir junctions. In addition, a multistory structure with a rectangular plan is considered to be anassemblage of two-dimensional frames and floor slabs connecting two adjacent frames at each floor level.This modeling concept can be easily applied to multistory structures with plans in the shape of L, T, Y,U, H, etc. To represent the in-plane deformation of floor slabs efficiently, a two-dimensional frame andthe floor slab connecting two adjacent frames at each flor level are modeled as a stick model with twodegrees of fredom per floor and a stiff beam with shear deformations, respectively. Three models areused to investigate the effect of in-plane deformation of the floor slab at the junction of wings on theseismic behavior of structures. Based on the comparison of dynamic analysis results obtained using theproposed models and three-dimensional finite element models, it could be concluded that the proposedmodels can be used as an efficient tool for an approximate analysis of a multistory structure with wings.