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Reforma 509 is a high-rise building located in the heart of the Central Business District of Mexico City.The building is comprised of office,hotel,residential and parking and forms part of a cluster of tall buildings in the area.If completed today,Reforma 509 would be the tallest building in Mexico,at 238m.All of the buildings gravity and lateral(wind and seismic)loads are carried by an architecturally expressed perimeter frame that is formed from highly efficient Steel Reinforced Concrete(SRC)columns coupled together by steel tube perimeter bracing.This paper investigates the implications of substituting a grade 50(fy=345 MPa)carbon steel with a higher strength micro-alloyed grade 70(fy=480 MPa)steel in the design of Reforma 509.This paper has shown that potential savings in material are possible if high strength steel is economically viable and can be competitively tendered in both the primary frame and connections.