This document analyzes patent data related to smart city technologies from 1998-2012. It finds that over 100,000 patent applications were published, with growth increasing over time. Almost half of patents were for smart buildings, followed by smart energy networks. The top patenting offices were from China, US, Korea, and Japan. Electrical engineering was the most common technological domain. French applicants most commonly filed in France and at the EPO, focusing especially on smart energy networks.