Tribune Tower Redevelopment Traffic Study Chicago, Illinois September 2017 Prepared for: Golub Adrian Smith + Gordon Gill Architecture Solomon Cordwell Buenz TABLE OF CONTENTS Introduction .................................................................................................................................................... 2 Existing Conditions ........................................................................................................................................ 4 Area Land Uses ......................................................................................................................................................... 4 Existing Roadway Network ........................................................................................................................................ 4 Transit Service ........................................................................................................................................................... 7 Divvy Bike Share ....................................................................................................................................................... 9 Traffic, Pedestrian, and Bicycle Counts ..................................................................................................................... 9 Observed Traffic Operation ..................................................................................................................................... 12 Development Characteristics ....................................................................................................................... 13 Proposed Development Plan ................................................................................................................................... 13 Land Uses ........................................................................................................................................................... 13 Site Access.......................................................................................................................................................... 13 Loading/Delivery .................................................................................................................................................. 13 Trip Generation ........................................................................................................................................................ 14 Directional Distribution ............................................................................................................................................. 17 Site Traffic Assignment ............................................................................................................................................ 17 Background Growth ................................................................................................................................................. 21 Total Traffic Projections ........................................................................................................................................... 21 Analyses ...................................................................................................................................................... 23 Capacity Analysis .................................................................................................................................................... 23 Upper Michigan Avenue/Upper Illinois Street ...................................................................................................... 26 Columbus Drive/Lower Illinois Street................................................................................................................... 27 Columbus Drive/Grand Avenue ........................................................................................................................... 27 Grand Avenue/St. Clair Street ............................................................................................................................. 27 Curbside Loading Evaluation ................................................................................................................................... 28 Delivery/Service Loading Dock Evaluation .............................................................................................................. 31 Summary ..................................................................................................................................................... 32 Tribune Tower Redevelopment Page 1 September 2017 INTRODUCTION Kimley-Horn and Associates, Inc., was retained by Adrian Smith + Gordon Gill Architecture (who is working in partnership with SCB Architecture under contract to Golub & Company) to conduct a traffic study for the proposed redevelopment of the Tribune Tower in Chicago, Illinois. As shown on Exhibit 1, the subject redevelopment would encompass the entire block bound by Michigan Avenue, Cityfront Plaza Drive, Illinois Street, and North Water Street/Pioneer Court, and would be executed in two phases. In the first phase, the landmarked Tribune Tower building on the West Parcel would be refurbished to provide 184 condominium units and approximately 69,300 square feet of retail. The second phase (to be constructed on the East Parcel as soon as in 2019) would replace an existing surface parking lot with a mixed-use tower containing 359 residential units, 228 hotel rooms, and 10,670 square feet of retail. In order to serve the residents and hotel guests of this development, two separate on-site parking garages would be constructed (one on each parcel). Vehicular access to these garages would be provided via lower-level streets within the study area. To serve the East Parcel, the development plan includes the creation of a lower-level alley that would preserve access to several underground utilities located along the western edge of this parcel. An access driveway to the East Parcel garage would connect to this alley, which would extend south from Lower Illinois Street at St. Clair Street to Lower North Water Street. The West Parcel garage would be accessed via a single driveway to Lower North Water Street east of Lower Michigan Avenue. This access configuration is intended to minimize the site’s vehicular impact on upper-level streets and promote a safe pedestrian environment around the site’s perimeter. This report includes an analysis of selected intersections in an area generally bound by Grand Avenue on the north, North Water Street on the south, Columbus Drive on the east, and Michigan Avenue on the west. This report documents the study methodology, summarizes data collected, presents an evaluation of the study intersections and site access/circulation, and highlights key findings and recommendations regarding transportation elements of the proposed development. Tribune Tower Redevelopment Page 2 September 2017 KINZIE ST WABASH AVE HUBBARD ST RUSH ST TWO WAY ONE WAY MICHIGAN AVE UPPER ILLINOIS ST ILLINOIS UPPER NORTH WATER ST TWO WAY ST. CLAIR ST CITYFRONT PLAZA DR COLUMBUS DR NORTH WATER ST WATER NORTH PARK DR LOWER ILLINOIS ST ILLINOIS LOWER GRAND AVENUE GRAND ONE WAY ONE ONE WAY ONE NEW ST Study Area Study Proposed Redevelopment - East Parcel East - Redevelopment Proposed Proposed Redevelopment - West Parcel West - Redevelopment Proposed LEGEND SITE LOCATION MAP LOCATION SITE MCCLURG CT EXHIBIT 1 EXHIBIT NOT TO SCALE TO NOT EXISTING CONDITIONS Kimley-Horn visited the site to collect relevant information pertaining to site context, surrounding land uses, the adjacent street system, current traffic volumes and operating conditions, lane configurations and traffic controls at nearby intersections, and other key transportation characteristics. This section of the report details information on these existing conditions. Area Land Uses The subject site is located along Chicago’s Magnificent Mile shopping district and is bound by Illinois Street on the north, Lower North Water Street on the south, Cityfront Plaza Drive on the east, and Michigan Avenue on the west. The western parcel is currently occupied by the historic Tribune Tower building and attached offices and retail space. The eastern parcel is currently a surface parking lot can be accessed via Lower Illinois Street and Lower North Water Street. The surrounding area is characterized by a dense mix of destination and neighborhood retail, residential, office, and restaurant uses. To the immediate south is Pioneer Court, a pedestrian plaza that stretches along the entire south side of the subject property and extends to the Chicago River approximately 350 feet south of the site. Existing Roadway Network The area roadways serving the proposed site primarily include Upper and Lower Michigan Avenue, Upper and Lower Illinois Street, Cityfront Plaza Drive, Columbus Drive, Grand Avenue, St. Clair Street, North Water Street, and Hubbard Street. Exhibit 2 illustrates the intersection control and lane configurations throughout the study network. Unless otherwise noted, all study area roadways are under the jurisdiction of the City of Chicago with an assumed 30 MPH speed limit, per City Ordinance. Michigan Avenue is a two-way, north-south roadway located along the western border of the subject site. Upper Michigan Avenue provides three travel lanes in each direction with a 15-foot- wide landscaped median that allows space for dedicated left-turn lanes at intersections. Two signalized crosswalks are present on Upper