JLL's City Momentum Index 2017 The City Momentum Index tracks the speed of change of a city's economy and commercial real estate market, identifying those cities that have the most dynamic attributes over the short and long term. The Index covers 134 major established and emerging business hubs across the globe. 42 elements of a city’s dynamism are covered, which are grouped into three main sub-indices; socio-economic momentum, commercial real estate momentum and high-value incubators. For more information, please visit www.jll.com/cities-research/City-Momentum