[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"redirects:L29ubGluZS1yZXNvdXJjZXMvYnVpbGRpbmdzLW9mLWNoaWNhZ28vb2xkLWNoaWNhZ28tbWFpbi1wb3N0LW9mZmljZQ==":3,"global-data":4,"page:L29ubGluZS1yZXNvdXJjZXMvYnVpbGRpbmdzLW9mLWNoaWNhZ28vb2xkLWNoaWNhZ28tbWFpbi1wb3N0LW9mZmljZQ==":554,"encyclopedia:callout":737},{},{"data":5},{"centerHours":6,"cruiseHomepage":18,"donateDetails":22,"environment":27,"errorImages":28,"footer":32,"generalInformation":194,"header":215,"hoursMessage":290,"menu":293,"searchOptions":327,"showNewsletter":14,"socialLinks":346,"specialClosures":354,"tourDetailPage":355,"announcements":361,"specialHours":363,"ticketPricingMap":364,"reservedUrlExceptions":551},{"friday":7,"monday":10,"saturday":11,"sunday":12,"thursday":13,"tuesday":16,"wednesday":17},{"closed":8,"open":9},"4:00 PM","10:00 AM",{"closed":8,"open":9},{"closed":8,"open":9},{"closed":8,"open":9},{"centerClosed":14,"closed":15,"open":9},true,"5:00 PM",{"centerClosed":14,"closed":15,"open":9},{"centerClosed":14,"closed":15,"open":9},{"@type":19,"id":20,"model":21},"@builder.io/core:Reference","3b5fc91c6f2a4abca17a9402644f03fd","tours",{"copy":23,"headline":24,"linkText":25,"linkUrl":26},"Every gift to the Chicago Architecture Center supports life-changing experiences.","DONATE","Donate","https://cart.architecture.org/donate/q/support","Production",{"altTag":29,"desktopImage":30,"mobileImage":31},"This is a decorative background image","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F769d6fb636124711a0e69d8887fbd16f","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F8296158e131b48c8a5133f27bab0f8a3",{"additionalLinks":33,"copyrightText":37,"footerLinks":38,"logo":45,"logoAlt":46,"menu":47},[34],{"label":35,"link":36},"Volunteer Portal","https://app.betterimpact.com/Login/Login?agencyGuid=9f3c84a3-5b68-4720-bd2d-5594a6a04b5f","© Copyright 2026",[39,42],{"label":40,"link":41},"Privacy Policy","/privacy-policy",{"label":43,"link":44},"Reports","/reports","https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F8031b7f1dadb4ec68d54bcb4d8900c1f","CAC Logo",[48,71,90,107,132,149,175],{"label":49,"mobileLabel":49,"url":50,"priority":51,"subitems":52},"City Tours","/city-tours",false,[53,56,59,62,65,68],{"label":54,"url":55},"Boat Tour","/city-tours/river-cruise",{"label":57,"url":58},"Walking Tours","/city-tours?tourType=Walking",{"label":60,"url":61},"Bus Tours","/city-tours?tourType=Bus",{"label":63,"url":64},"Field Trips","/events-programs/schools-and-teachers/field-trips",{"label":66,"url":67},"Group & Private Tours","/city-tours/group-and-private-tours",{"label":69,"url":70},"Accessibility & Safety","/city-tours/accessibility-and-safety",{"label":72,"mobileLabel":72,"url":73,"priority":51,"subitems":74},"Visit the Center","/visit-the-center",[75,78,81,84,87],{"label":76,"url":77},"Exhibitions","/visit-the-center/exhibitions",{"label":79,"url":80},"Events & Programs","/events-programs",{"label":82,"url":83},"Buy Center Tickets","/visit-the-center/buy-center-tickets",{"label":85,"url":86},"Design Store","https://shop.architecture.org",{"label":88,"url":89},"Venue Rental","/visit-the-center/venue-rental/",{"label":79,"mobileLabel":79,"url":80,"priority":51,"subitems":91},[92,95,98,101,104],{"label":93,"url":94},"General Public","/events-programs?category=General+Public#",{"label":96,"url":97},"Schools & Teachers","/events-programs?category=Schools+%2B+Teachers#",{"label":99,"url":100},"Youth & Family","/events-programs?category=Youth+%2B+Family#top",{"label":102,"url":103},"Civic & Industry","/civic-industry",{"label":105,"url":106},"Open House Chicago","https://openhousechicago.org",{"label":108,"mobileLabel":108,"url":109,"priority":51,"subitems":110},"Online Resources","/online-resources",[111,114,117,120,123,126,129],{"label":112,"url":113},"Buildings of Chicago","/buildings-of-chicago",{"label":115,"url":116},"Architecture Encyclopedia","/online-resources/architecture-encyclopedia",{"label":118,"url":119},"CAC Watch List","/online-resources/cac-watch-list",{"label":121,"url":122},"Exhibition Archives","/online-resources/archived-exhibitions",{"label":124,"url":125},"City Planning Resources","/online-resources/chicago-city-planning-resources",{"label":127,"url":128},"Educator Resources","/online-resources/educator-resources",{"label":130,"url":131},"Stories of Chicago ","/online-resources/stories-of-chicago",{"label":133,"mobileLabel":133,"url":134,"priority":51,"subitems":135},"Join & Give","/join-and-support",[136,139,142,145,148],{"label":137,"url":138},"Become a Member","/join-and-support/membership",{"label":140,"url":141},"Individual Giving","/join-and-support/individual",{"label":143,"url":144},"Corporate Giving","/join-and-support/business",{"label":146,"url":147},"Volunteer","/join-and-support/volunteer",{"label":25,"url":26},{"label":150,"mobileLabel":151,"url":152,"priority":51,"subitems":153},"About","About CAC","/about",[154,157,160,163,166,169,172],{"label":155,"url":156},"Our History","/about/our-history",{"label":158,"url":159},"Our Team","/about/our-team",{"label":161,"url":162},"In the News","/in-the-news",{"label":164,"url":165},"Careers","/about/careers",{"label":167,"url":168},"Land Acknowledgement","/about/land-acknowledgment",{"label":170,"url":171},"Media Kit","/about/media-kit",{"label":173,"url":174},"Contact Us","/contact-us",{"label":176,"mobileLabel":176,"url":177,"priority":51,"subitems":178},"FAQS","/faq",[179,182,185,188,191],{"label":180,"url":181},"Boat Tour FAQ","/faq/cac-river-cruise",{"label":183,"url":184},"Walking & Bus Tour FAQ","/faq/walking-and-bus-tours",{"label":186,"url":187},"Group & Private Tour FAQ","/faq/group-and-private-tours",{"label":189,"url":190},"Membership FAQ","/faq/membership/",{"label":192,"url":193},"Open House FAQ","/faq/open-house-chicago",{"additionalPhones":195,"address":211,"email":212,"phoneNumber":200,"riverCruiseAddress":213,"siteName":214},[196,199,202,205,208],{"phone":197,"title":198},"10 AM - 4 PM","Call center hours",{"phone":200,"title":201},"312.922.3432","General Inquiries",{"phone":203,"title":204},"312.922.TOUR (8687)","Tickets",{"phone":206,"title":207},"312.922.8687","Membership",{"phone":209,"title":210},"312.322.1130","Group Sales","111 E. Wacker Drive, Chicago IL 60601","info@architecture.org","112 E. Wacker Drive, chicago, IL 60601","Chicago Architecture Center",{"alt":216,"logo":217,"menu":218},"Chicago Architecture Center's logo","https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F841bd2738c0349caa783510d7a578560",[219,228,238,248,257,265,280],{"label":49,"mobileLabel":220,"url":50,"priority":14,"subitems":221},"All City Tours",[222,223,224,225,226,227],{"label":54,"url":55},{"label":57,"url":58},{"label":60,"url":61},{"label":63,"url":64},{"label":66,"url":67},{"label":69,"url":70},{"label":79,"mobileLabel":229,"url":80,"priority":14,"subitems":230},"All Events & Programs",[231,233,235,237],{"label":93,"url":232},"/events-programs?category=General+Public",{"label":96,"url":234},"/events-programs?category=Schools%2520%252B%2520Teachers",{"label":99,"url":236},"/events-programs?category=Youth+%2B+Family",{"label":102,"url":103},{"label":239,"mobileLabel":240,"url":73,"priority":14,"subitems":241},"Visit","Center Information",[242,243,245,247],{"label":76,"url":77},{"label":79,"url":244},"/events-programs/",{"label":246,"url":86},"Shop the Design Store",{"label":88,"url":89},{"label":108,"mobileLabel":249,"url":109,"priority":14,"subitems":250},"All Online Resources",[251,253,254,255,256],{"label":112,"url":252},"/online-resources/buildings-of-chicago",{"label":115,"url":116},{"label":118,"url":119},{"label":124,"url":125},{"label":127,"url":128},{"label":133,"mobileLabel":258,"url":134,"priority":14,"subitems":259},"Ways to Join & Give",[260,261,262,263,264],{"label":137,"url":138},{"label":140,"url":141},{"label":143,"url":144},{"label":146,"url":147},{"label":25,"url":26},{"label":105,"mobileLabel":266,"url":267,"priority":51,"subitems":268},"Open House Chicago Homepage","/open-house-chicago/about",[269,271,274,277],{"label":270,"url":267},"About OHC",{"label":272,"url":273},"Photo Competition","/open-house-chicago/photo-competition-2025",{"label":275,"url":276},"OHC Volunteer","/open-house-chicago/volunteer",{"label":278,"url":279},"OHC Archived Sites","/open-house-chicago/archive",{"label":150,"mobileLabel":281,"url":152,"priority":51,"subitems":282},"About the CAC",[283,284,285,286,288,289],{"label":155,"url":156},{"label":158,"url":159},{"label":164,"url":165},{"label":287,"url":162},"In The News",{"label":170,"url":171},{"label":173,"url":174},{"message":291,"show":14,"title":292},"Please note that last entry to the Center will be an hour before closing time.\n\nThe Center is closed Thanksgiving, Christmas and New Year’s Day. It closes early at 3pm on Thanksgiving Eve, Christmas Eve and New Year's Eve.","Center and Holiday Hours",{"bottomLink":294,"cta":307,"iconLinks":317},{"left":295,"right":304},[296,298,300,301],{"label":297,"link":177},"FAQs",{"label":173,"link":299},"/about/contact-us",{"label":43,"link":44},{"label":302,"link":303},"Newsletter Sign-up","/subscribe",[305],{"label":306,"link":36},"Docent & Volunteer Portal",{"button":308,"description":312,"image":313,"title":316},{"label":309,"link":310,"title":311},"Get on board!","https://www.architecture.org/city-tours/river-cruise","Go to river cruise landing page","Be ready for the first departure of the season on March 15!",{"alt":314,"src":315},"Grand tour boat with tourists seated and graphic of skyscrapers in background.","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F21a8b82c6c5d40ea9e0bd61e8f800948","Tickets on sale now!",[318,322,324],{"icon":319,"label":320,"link":321},"https://cdn.builder.io/api/v1/file/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F53693c97fea141e5a6708ff86ff306bf","Calendar","/calendar",{"icon":323,"label":25,"link":26},"https://cdn.builder.io/api/v1/file/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F090fb84be62342a69184791ea102a702",{"icon":325,"label":326,"link":86},"https://cdn.builder.io/api/v1/file/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F6460da61a1db460588bd3549fdea03b8","Shop",{"commonResults":328,"defaultSearchLabel":344,"resultsLabel":345},[329,333,336,340],{"description":330,"model":331,"title":332,"url":177},"Find answers to your questions related to the CAC","webpage","Frequently Asked Questions",{"description":334,"model":331,"title":335,"url":73},"View center hours, location and other helpful info","Plan Your Visit",{"description":337,"model":338,"title":339,"url":55},"View boat departure times, location and more helpful details","tour","Book a River Cruise",{"description":341,"model":342,"title":343,"url":321},"From tours to educational programs, exhibitions and more, find something fun to do based on your available dates","calendar","CAC Calendar of Events","Common Search Results","Your Search Results",{"facebook":347,"instagram":348,"linkedin":349,"pinterest":350,"tiktok":351,"x":352,"youtube":353},"https://www.facebook.com/chiarchitecture","https://www.instagram.com/chiarchitecture","https://www.linkedin.com/company/chicago-architecture-center/","https://www.pinterest.com/chiarchitecture/","https://www.tiktok.com/@chiarchitecture","https://twitter.com/chiarchitecture","https://www.youtube.com/@ChicagoArchitecture","Due to weather, all tours are cancelled and the Center will be closed January 16, 2024",{"accessibilityMessage":356,"buttonLabel":357,"selectTicketType":358},"\u003Cp>\n  To request accessibility accommodations, please\n  \u003Ca href=\"/about/contact-us\" rel=\"noopener noreferrer\">contact us\u003C/a>.\n\u003C/p>\n","Buy Tickets",{"label":359,"message":360},"Select ticket type","\u003Cp>\n  CAC members must login to access special ticket pricing. To purchase 10 or\n  more tickets, please visit&nbsp;\u003Ca\n    href=\"/city-tours/group-and-private-tours\">Group &amp; Private Tours\u003C/a\n  >.\n\u003C/p>\n",{"data":362},[],[],[365,399,420,431,437,442,449,464,478,495,513,532],{"label":366,"priceTypeIds":367,"title":384,"membershipDescriptions":385},"Dual Members and above",[368,370,372,374,376,378,380,382],{"id":369},175,{"id":371},176,{"id":373},189,{"id":375},190,{"id":377},191,{"id":379},198,{"id":381},244,{"id":383},245,"Dual Members and above -> 175, 176, 189, 190, 191, 198, 244, 245",[386,389,391,393,395,397],{"limit":387,"description":388},8,"Dual",{"description":390,"limit":387},"Family",{"description":392,"limit":387},"Deco",{"description":394,"limit":387},"Grand Deco",{"limit":387,"description":396},"Beaux Arts",{"description":398,"limit":387},"Grand Beaux Arts",{"title":400,"membershipDescriptions":401,"priceTypeIds":408,"label":419},"All Members -> 175, 176, 189, 190, 191, 192, 198, 244, 245",[402,403,404,405,406,407],{"limit":387,"description":388},{"description":390,"limit":387},{"limit":387,"description":392},{"limit":387,"description":394},{"description":396,"limit":387},{"limit":387,"description":398},[409,410,411,412,413,414,416,417,418],{"id":369},{"id":371},{"id":373},{"id":375},{"id":377},{"id":415},192,{"id":379},{"id":381},{"id":383},"Members",{"title":421,"priceTypeIds":422,"label":424,"membershipDescriptions":425,"membershipDescription":429},"Individual Members -> 192",[423],{"id":415},"Individual Members",[426],{"limit":427,"description":428},1,"Individual",[430],{},{"priceTypeIds":432,"label":435,"title":436},[433],{"id":434},178,"Child","Child -> 178",{"priceTypeIds":438,"label":440,"title":441},[439],{"id":427},"Individual Ticket","Individual Ticket -> ID: 1",{"membershipDescriptions":443,"priceTypeIds":446,"label":445,"title":448},[444],{"description":445,"limit":387},"Burnham Society",[447],{"id":377},"Burnham Society -> ID: 191",{"membershipDescription":450,"title":452,"label":453,"membershipDescriptions":454,"priceTypeIds":460},[451],{},"Members -> 192, 244, 245","Basic Members",[455,456,458],{"description":428,"limit":427},{"limit":457,"description":388},2,{"limit":459,"description":390},4,[461,462,463],{"id":415},{"id":381},{"id":383},{"membershipDescriptions":465,"priceTypeIds":470,"label":476,"title":477},[466,467,468,469],{"limit":387,"description":392},{"limit":387,"description":394},{"limit":387,"description":396},{"limit":387,"description":398},[471,472,473,474,475],{"id":369},{"id":371},{"id":373},{"id":375},{"id":377},"Deco Members and above","Deco Members and above -> 175, 176, 189, 190, 191",{"membershipDescriptions":479,"title":486,"priceTypeIds":487,"label":366},[480,481,482,483,484,485],{"limit":387,"description":388},{"description":390,"limit":387},{"description":392,"limit":387},{"description":394,"limit":387},{"description":396,"limit":387},{"limit":387,"description":398},"Dual Members and above -> 175, 176, 189, 190, 191, 244, 245",[488,489,490,491,492,493,494],{"id":369},{"id":371},{"id":373},{"id":375},{"id":377},{"id":381},{"id":383},{"membershipDescriptions":496,"title":504,"label":419,"priceTypeIds":505},[497,498,499,500,501,502,503],{"limit":387,"description":428},{"limit":387,"description":388},{"description":390,"limit":387},{"limit":387,"description":392},{"limit":387,"description":394},{"description":396,"limit":387},{"limit":387,"description":398},"All Members -> 189, 190, 191, 192, 198, 244, 245",[506,507,508,509,510,511,512],{"id":373},{"id":375},{"id":377},{"id":415},{"id":379},{"id":381},{"id":383},{"membershipDescriptions":514,"label":419,"title":522,"priceTypeIds":523},[515,516,517,518,519,520,521],{"limit":387,"description":388},{"description":390,"limit":387},{"description":392,"limit":387},{"limit":387,"description":394},{"description":396,"limit":387},{"description":398,"limit":387},{"description":428,"limit":387},"All Members -> 175, 176, 189, 190, 191, 192, 244, 245",[524,525,526,527,528,529,530,531],{"id":369},{"id":371},{"id":373},{"id":375},{"id":377},{"id":415},{"id":381},{"id":383},{"priceTypeIds":533,"label":419,"title":542,"membershipDescriptions":543},[534,535,536,537,538,539,540,541],{"id":369},{"id":371},{"id":373},{"id":375},{"id":415},{"id":379},{"id":381},{"id":383},"All Members -> 175, 176, 189, 190, 192, 198, 244, 245",[544,545,546,547,548,549,550],{"limit":387,"description":388},{"limit":387,"description":390},{"limit":387,"description":392},{"description":394,"limit":387},{"description":396,"limit":387},{"description":398,"limit":387},{"description":428,"limit":387},{"/events-programs/engineering-fest/agenda27":552,"/events-programs/engineering-fest/agenda26":552,"/events-programs/princeton-cac-fellowship":552,"/events-programs/girls-build/gbd-agenda2025":552,"/events-programs/efest-2025/agenda":552,"/online-resources/chicago-city-planning-resources":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/resources-activities":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/discussion-questions":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/chapter-3":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/chapter-2":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/chapter-1":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit/getting-started":552,"/online-resources/educator-resources/no-small-plans/readers-toolkit":552,"/events-programs/about-girls-build":552,"/events-programs/girls-build-day-2024/agenda":552,"/about/our-team/leadership-team/*":553,"/about/our-team":552,"/about/our-team/board-of-trustees":552,"/city-tours/concierge-information":552,"/city-tours/accessibility-and-safety":552,"/city-tours/field-trips":552,"/city-tours/group-and-private-tours":552,"/events-programs/schools-and-teachers/field-trips":552},"page","team-members",{"folders":555,"createdDate":556,"id":557,"name":558,"modelId":559,"published":560,"meta":561,"query":564,"data":570,"variations":728,"lastUpdated":729,"firstPublished":730,"previewUrl":731,"testRatio":427,"screenshot":732,"createdBy":733,"lastUpdatedBy":734,"@originModelId":735,"rev":736},[],1716436046539,"138c072f30eb98c32e526e6a3330058bdc196e15e0bb007fb802f9bc420f06eb","Old Chicago Main Post Office","dd95aa877133b84cce88167a62e8923e96449f8cca34c903536561c6b4b10355","published",{"hasLinks":51,"kind":552,"lastPreviewUrl":562,"symbolsUsed":563},"https://www.architecture.org/online-resources/buildings-of-chicago/old-chicago-main-post-office?builder.space=e61abde79d954ddab2b6092044c4b5a1&builder.user.permissions=read%2Ccreate%2Cpublish%2CeditCode%2CeditDesigns%2CeditLayouts%2CeditLayers%2CeditContentPriority&builder.user.role.name=Developer&builder.user.role.id=developer&builder.cachebust=true&builder.preview=buildings&builder.noCache=true&builder.allowTextEdit=true&__builder_editing__=true&builder.overrides.buildings=138c072f30eb98c32e526e6a3330058bdc196e15e0bb007fb802f9bc420f06eb&builder.overrides.138c072f30eb98c32e526e6a3330058bdc196e15e0bb007fb802f9bc420f06eb=138c072f30eb98c32e526e6a3330058bdc196e15e0bb007fb802f9bc420f06eb&builder.options.locale=Default",{"38b31f6ce3e244bd92e69083c5cb340d":14,"271ab26f6707fb66b6e185940510b49c2ba705a9cdab745c0341202859834135":14,"e321e55f9c504496bb5d077d1027f2d7":14,"ed372956eb6e42b8bbdcae73607e0be4":14},[565],{"@type":566,"property":567,"operator":568,"value":569},"@builder.io/core:Query","urlPath","is","/online-resources/buildings-of-chicago/old-chicago-main-post-office",{"forceUpdatedURLOn":571,"imageList":572,"title":558,"architect":582,"useType":584,"originalCompletionDate":586,"description":587,"streetAddress":588,"neighborhood":589,"url":569,"state":590,"query":598,"buildingName":558,"officialName":558,"environment":27,"googleMapLink":600,"style":601,"blocks":603},"2024-08-08T22:12:58.611Z",[573,577,580],{"source":574,"src":575,"caption":576,"alt":558},"","https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2Fa2ab095841c94343944b52a83b64ca62","Courtesy of Ryerson and Burnham Art and Architecture Archive",{"src":578,"caption":579,"alt":558},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F71fdf1a72eef4c88bea3fa6e39d2df5b","Post Office Building 1932 courtesy of Ryerson and Burnham Art and Architecture Archive",{"src":581,"alt":558,"caption":576},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2Ff97a6cff1b4d4bf9a8478106e89f0029",[583],"Graham, Anderson, Probst & White",[585],"Commercial Office","1921/1932 Renovation: 2019","\u003Cp>Even before Chicago was officially designated a town in 1833, the community had a post office. As the city grew, the facility relocated several times to accommodate an ever-rising amount of mail.\u003C/p>","433 W. Van Buren","West Loop",{"deviceSize":591,"location":592},"large",{"pathname":569,"path":593,"query":597},[594,595,596],"online-resources","buildings-of-chicago","old-chicago-main-post-office",{},[599],{"@type":566,"property":567,"operator":568,"value":569},"https://maps.app.goo.gl/Hz8vVG2eBMa2vmH37",[602],"Art Deco",[604,716],{"@type":605,"@version":457,"id":606,"meta":607,"children":609,"responsiveStyles":714},"@builder.io/sdk:Element","builder-966f20458a264d5fa63883f864f57dcd",{"previousId":608},"builder-151fa9aec3f9461794b5afa1e86a6304",[610,625,653,665,687,696,705],{"@type":605,"@version":457,"id":611,"meta":612,"component":614,"responsiveStyles":618},"builder-03099cf3ba6249efb586897bfa9344c6",{"previousId":613},"builder-fe8e7cf58213465480ca5683a6390130",{"name":615,"options":616},"Text",{"text":617},"\u003Cp>What we know today as the Old Post Office was completed in two phases between 1921 and 1932 by Graham, Anderson, Probst and White, a successor firm to D.H. Burnham and Co. With its location above railroad tracks along the west bank of the Chicago River and its proximity to Union Station, the Old Post Office is one of the most significant buildings that was a direct result of the 1909 Plan of Chicago.\u003C/p>\u003Ch4>at a crossroads of style \u003C/h4>\u003Cp>At the time it was designed, Chicago was at a crossroads of popular architectural styles. The dominant Beaux-Arts style of the 1893 World’s Fair was still strong, however, Art Deco (then known simply as Moderne) was on the rise. The Old Post Office is a unique blend of both—a classically-influenced version of Art Deco.\u003C/p>\u003Cp>Spanning over two city blocks, the Old Post Office stretches over railroad tracks and is known for having the Ida B. Wells Drive run through the building from east to west. Most of the building stands at around 190 feet high, translating into 12 floors in the building’s north section and nine floors for the rest of the building. The steel-frame structure features black granite at the base with gray limestone above. Vertical details, including large, tall windows with chevrons and vertical fluting, provide a visual counterpoint to the broad horizontality of the structure.\u003C/p>\u003Cp>Inside, the main lobby soars 38 feet in height, featuring white marble-clad walls and stone floors in a checkerboard pattern. It has modernized classical forms and proportions combined with Deco-style details such as eagles and low-relief panels. Gold panels with stylized ornament honoring railroads and other motifs associated with the postal service are found throughout the hall.\u003C/p>\u003Ch4>35 million letters and 500,000 sacks of mail and packages daily.\u003C/h4>\u003Cp>In the 1930s, the Old Post Office was touted as the largest post office in the world, with more than two million square feet of floor space. It could handle 35 million letters and 500,000 sacks of mail and packages daily. Dozens of trains brought mail in and out of the building, while more than 5,000 trucks entered and exited the building every day. For a time in the 1940s and 1950s, mail helicopters used the roof as a landing pad. In addition to the postal facilities, the building also housed offices for administrative staff, an office for the Sixth Army Corps of Engineers, a cafeteria, sit-down restaurant, employee bank, first aid center, and a branch of the Chicago Public Library exclusively for post office staff.\u003C/p>\u003Cp>In the 1960’s automated systems were introduced, and by 1996 a new central post office was completed and the Old Post Office building closed. It sat dormant for decades, with its future uncertain.\u003C/p>\u003Cp>In 2011, British real estate developer Bill Davies completed the purchase of the dilapidated building and property for $38 million. His proposed redevelopment plan which included the building of 2000-foot tall twin towers that would be the tallest in North America—was never realized, and he sold the building to 601W, a New York City-based real estate company on May 13, 2016. Davies died the following day.\u003C/p>\u003Ch4>The Old Post Office Today\u003C/h4>\u003Cp>Extensive renovations followed—led by Gensler—and the building opened to office tenants in October 2019. The historic features were immaculately restored, and the interior transformed to accommodate modern office spaces. Today, the Old Post Office boasts more than 2.5 million square feet of multi-use office and event space including a 3.5-acre urban rooftop oasis—the largest of its kind in the city—complete with a running track, pickleball courts, basketball courts, and a stunning skyline view of the city.\u003C/p>",{"large":619},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},"flex","column","relative","0","border-box",{"@type":605,"@version":457,"id":626,"meta":627,"component":629,"responsiveStyles":651},"builder-c644086ad01f44cf9da20e78e5b1cbc2",{"previousId":628},"builder-553f0f4888f7423ab9258394e767fefa",{"name":630,"options":631},"Fact Carousel",{"factList":632},[633,639,642,645,648],{"body":634,"title":635,"icon":636},"\u003Cp>In 1966, the post office came to a halt when a logjam of 10 million pieces of mail clogged the system for nearly a week.\u003C/p>","Did you know?",{"src":637,"alt":638},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F6eb8f64ac9e149c9869e201bde237839","Icon of two buildings. One in red and one is taller.",{"body":640,"title":635,"icon":641},"\u003Cp>The building was used in the filming of Batman Begins in 2004, The Dark Knight in 2007 and Transformers: Dark of the&nbsp;Moon in 2010.\u003C/p>",{"src":637,"alt":638},{"body":643,"title":635,"icon":644},"\u003Cp>Prior to the 1830s, before a formal post office was designated, mail was delivered to the home of trader John Kinzie for distribution.\u003C/p>",{"src":637,"alt":638},{"body":646,"title":635,"icon":647},"\u003Cp>In 1855, the federal government finally constructed a U.S. Post Office at the NW corner of Dearborn and Monroe, it burned down in the Great Chicago Fire of 1871.\u003C/p>",{"src":637,"alt":638},{"body":649,"title":635,"icon":650},"\u003Cp>With headquarters in Chicago, major mail-order companies such as Sears, Roebuck &amp; Co. and Montgomery Ward greatly contributed to the city’s need for a large postal facility.\u003C/p>",{"src":637,"alt":638},{"large":652},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"@type":605,"@version":457,"id":654,"component":655,"responsiveStyles":663},"builder-30904a7eb07c4bb9bda14a82ef264d26",{"name":656,"options":657},"Symbol",{"symbol":658},{"data":659,"model":660,"entry":661,"ownerId":662},{},"symbol","e321e55f9c504496bb5d077d1027f2d7","e61abde79d954ddab2b6092044c4b5a1",{"large":664},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"@type":605,"@version":457,"layerName":666,"id":667,"meta":668,"component":670,"responsiveStyles":685},"Encyclopedia Callout","builder-dd2a3aa826284fb9adb060f44ea1257f",{"previousId":669},"builder-09276bec5b424c54a8960575975efd3e",{"name":666,"options":671},{"automaticallyFetchArticles":51,"manualArticlesList":672,"headline":680,"button":681,"copy":684},[673,677],{"encyclopediaArticle":674},{"@type":19,"id":675,"model":676},"c9f0363b8d165c10b46c2c397aebeff5483d8222e3ae92c87775181d96b8a880","architecture-encyclopedia-articles",{"encyclopediaArticle":678},{"@type":19,"id":679,"model":676},"83b2739324f081b816b84f1d178adb3ee17660073c7ee88efe75ecdc3d64d566","Architecture encyclopedia references for this building",{"label":682,"title":682,"url":683},"See full encyclopedia","/architecture-encyclopedia","\u003Cp>\u003Cbr>\u003C/p>",{"large":686},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"@type":605,"@version":457,"id":688,"component":689,"responsiveStyles":694},"builder-4ebca7ad4b7c46159f95dc74428996e2",{"name":656,"options":690},{"symbol":691},{"data":692,"model":660,"entry":693,"ownerId":662},{},"38b31f6ce3e244bd92e69083c5cb340d",{"large":695},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"@type":605,"@version":457,"id":697,"component":698,"responsiveStyles":703},"builder-ff22bb2bceb0419bb12ad7615d22cb9b",{"name":656,"options":699},{"symbol":700},{"model":660,"entry":701,"ownerId":662,"data":702},"271ab26f6707fb66b6e185940510b49c2ba705a9cdab745c0341202859834135",{},{"large":704},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"@type":605,"@version":457,"id":706,"component":707,"responsiveStyles":712},"builder-7fb360e1289c484b847aa6b7012cdcab",{"name":656,"options":708},{"symbol":709},{"model":660,"entry":710,"ownerId":662,"data":711},"ed372956eb6e42b8bbdcae73607e0be4",{},{"large":713},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"large":715},{"display":620,"flexDirection":621,"position":622,"flexShrink":623,"boxSizing":624},{"id":717,"@type":605,"tagName":718,"properties":719,"responsiveStyles":723},"builder-pixel-n63gh6blrai","img",{"src":720,"aria-hidden":721,"alt":574,"role":722,"width":623,"height":623},"https://cdn.builder.io/api/v1/pixel?apiKey=e61abde79d954ddab2b6092044c4b5a1","true","presentation",{"large":724},{"height":623,"width":623,"display":725,"opacity":623,"overflow":726,"pointerEvents":727},"block","hidden","none",{},1736199024030,1716436801788,"https://www.architecture.org/online-resources/buildings-of-chicago/old-chicago-main-post-office","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F627c15281d494357a111ce826320d5f0","9UZTQKHnWjeK0eNHYuv3D5X3zRN2","N7q5cnaLMCZa97H5xEs93eDsDl22","9b568dcd19dc4d56b032da8e6df9fd71","rdbyibk41ul",[738,756,772],{"id":679,"name":739,"data":740},"1909 Plan of Chicago",{"title":739,"imageList":741,"category":754,"isPopular":14,"url":755},[742,745,748,751],{"src":743,"caption":744},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F70678a65b3ac4282ac05ac6666eb6add","1909 Plan of Chicago, title pages.",{"src":746,"caption":747},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F27279b11792946c4829fd2bb0f2fa1e3","1909 Plan of Chicago, Civic Center Plaza",{"src":749,"caption":750},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2Fd8accb59c32741b08589a9ff5a13334d","1909 Plan of Chicago, view looking west over city",{"src":752,"caption":753},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F5b8f72b685a04d9c9b854b4ca3318ff0","1909 Plan of Chicago, plan of street and boulevard system.","Milestone","/online-resources/architecture-encyclopedia/1909-plan-of-chicago",{"id":675,"name":602,"data":757},{"title":602,"imageList":758,"category":770,"url":771},[759,762,764,767],{"src":760,"caption":761},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2Ff78b99eb314f43f08fead32b7b9ee88f","Chicago Board of Trade, photo by Eric Allix Rogers",{"src":763,"caption":761},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F1bd1bd8f3050491580cf1f06a4527658",{"src":765,"caption":766},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F8b660a7e5cee4f29b3afedc4412cb5da","Carbide and Carbon Building",{"src":768,"caption":769},"https://cdn.builder.io/api/v1/image/assets%2F49af4dfb0fbc43d58bf8ce407e839d74%2F534ebdd950da42aa8cea47ca0f061cc5","Merchandise Mart","Style","/online-resources/architecture-encyclopedia/art-deco",{"id":773,"name":774,"data":775},"afcb1b58b0f74505a282c6ede4460303","Adrian Smith",{"title":774,"alphabeticalTitle":774,"imageList":776,"category":788,"url":789},[777,780,784],{"alt":778,"caption":774,"src":779},"Image of a caucasian man with white hair and glasses.","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F1fd53a27292341f6b9bdd99091a0cf93",{"src":781,"caption":782,"alt":783},"https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2Ff34300e5b81c44e18977bfc885fb56e3","Burj Khalifa. Photo by Nick Merrick & Hedrich Blessing","Image of a tall skyscraper standing high above any surrounding buildings.",{"alt":785,"src":786,"caption":787},"Image of the facade of a black building with tall windows and a \"C\" on the face of it.","https://cdn.builder.io/api/v1/image/assets%2Fe61abde79d954ddab2b6092044c4b5a1%2F1c9b286d42094cccb35e78c49c84b56c","Chicago Architecture Center renovation by Smith + Gill","Architect/Firm","/online-resources/architecture-encyclopedia/adrian-smith"]