Indian Standard requires reinforced concrete (RC) buildings to have RC structural walls for enhanced seismic safety. RC walls provide significant stiffness and strength to buildings. In steel buildings though, only provisions for use of concentrically braced frames are available. Thus, the possibility of integrating RC structural walls in steel moment frame buildings to act as a dual system is explored in this study. Here, an RC wall is integrated with typical steel W-section columns at either end to ensure composite action; these are named RC wall sections with steel end-columns (RCWSECs). In the study, 5-storey and 10-storey buildings with perimeter steel special moment-resisting frames are designed with varying amounts of RCWSECs (of 9 m length); the design uses general provisions of Indian Standards. The performance of the building models is evaluated using nonlinear static and dynamic analyses. Seismic deformation demands are investigated in terms of drift ratio and plastic rotation at the base of the RCWSECs. Finally, recommendation is made related to use of suitable magnification factor for design of (i) RCWSECs for shear, and (ii) shear connectors at the steel-concrete interface of the RCWSECs, to ensure ductile response of such buildings.