The first part of this presentation explores the relationship between tall buildings and energy use by examining the publically available data from municipal energy benchmarking ordinances. The analysis of this data examines correlations between building size, age, utility profiles and energy consumption. The second portion of the presentation compares city benchmarking and CBECS data sets against a pool of newly designed/constructed tall building energy model simulations. The purpose of this analysis is to compare the simulated performance against actual consumption in order to better understand trends in new tall building design as well as assess if these simulations are reasonable representations of actual tall building performance.