Airborne lidar data covering Chicago, IL collected in November 2011 as part of the NGA 133 cities project. The project area was approximately 2344 square kilometers. The LiDAR was collected and processed to meet the Nominal Post Spacing (NPS)requirement of 1.0 meters. The data was collected using a Leica ALS50-II 150 kHz Multiple Pulses in Air (MPiA) LiDAR sensor installed in a Leica gyro-stabilized PAV30 mount. The ALS50-II 150 kHz sensor collects up to four returns per pulse, as well as intensity data, for the first three returns. If a fourth return was captured, the system does not record an associated intensity value. This data set is an LAZ (compressed LAS) format file containing LIDAR point cloud data.