page_title: 311 South Wacker Drive
section_title: Crown
hierarchical_section_title: 311 South Wacker Drive / Crown
caption_attribution_description: English: CNA’s building is often illuminated to reflect civic happenings or to acknowledge a meaningful calendar landmark. This design recognizes Breast Cancer Awareness Month.
context_page_description: 311 South Wacker Drive is a post-modern 65-story skyscraper located in Chicago, Illinois, and completed in 1990. At 961 feet tall, it is the seventh-tallest building in Chicago and the 24th tallest in the United States. It was once the tallest reinforced concrete building in the world. 311 South Wacker was also the tallest building in the world known only by its street address, until it was surpassed in height by New York's 432 Park Avenue in 2015.
  The lower level of the winter garden was designed for a possible connection via underground passageway to Chicago Union Station. The building also contains three levels of underground parking. The building contains both retail and commercial tenants.
context_section_description: The top of the building is a 105-foot (32 m)-tall translucent cylinder, surrounded by four other smaller cylinders, which was inspired by the massing of the Tribune Tower. This makes it among the most visible Chicago skyscrapers at night, as its crown is brightly illuminated. The five cylinders on top are lit at night by 1,852 fluorescent tubes, and a lantern at the top changes colors for various holidays and special events.
caption: CNA's building illuminated to reflect Breast Cancer Awareness Month. 311 South Wacker Drive can be seen in the left, with the top portion brightly illuminated.
exif: {"Image ImageDescription": "", "Image Make": "SONY", "Image Model": "CYBERSHOT", "Image Orientation": "Horizontal (normal)", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS Macintosh", "Image DateTime": "2006:11:14 08:38:06", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "260", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "794", "Thumbnail JPEGInterchangeFormatLength": "7654", "EXIF ExposureTime": "1/2", "EXIF FNumber": "21/10", "EXIF ExposureProgram": "Shutter Priority", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2005:10:19 19:40:38", "EXIF DateTimeDigitized": "2005:10:19 19:40:38", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "2", "EXIF ExposureBiasValue": "2", "EXIF MaxApertureValue": "33/16", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "other light source", "EXIF Flash": "Flash did not fire", "EXIF FocalLength": "14", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "900", "EXIF ExifImageLength": "1144", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "668", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Manual", "EXIF SceneCaptureType": "Standard"}