Editing Willis Tower (section)

=== Interior ===

==== Base ====
[[File:Base of the Willis Tower (2021).jpg|thumb|223x223px|Bottom of the tower]]
When the building was completed, the main entrance was on Wacker Drive to the west. There was a plaza on the south side of the building, sloping upward toward Franklin Street to the east. The Franklin Street side of the building was {{Convert|6|ft}} lower than the Wacker Drive entrance, so the entrances on Franklin Street were actually below the plaza, leading to the building's lower mezzanine.<ref name="p169950437" /> Below ground level are three basement levels with a total area of {{convert|400000|ft2}}.<ref name="nyt-1970-10-18" /> The basements included a 1,200-seat cafeteria, commercial space, service areas, and a loading dock for 17 trucks.<ref name="Drexler Menges 2009 p." /> The basement also contained a 150-spot parking garage.<ref name="p170442312" />

{{As of|2022}}, the building's base covers {{convert|463000|ft2}} and contains two lobbies for tenants.<ref name="Rogal 2022" /><ref name="architecturalrecord.com" /> The building's tenants primarily enter from Wacker Drive and Franklin Street. Shoppers, restaurant patrons, and visitors to the Skydeck observation deck use the southern entrance on Jackson Boulevard.<ref name="Chicago YIMBY 2020" /> The Wacker Drive lobby contains ''In the Heart of this Infinite Particle of Galactic Dust'', a 2019 artwork by Jacob Hashimoto. It consists of over 7,000 rice-paper and resin disks that are hung from the ceiling.<ref name="Willis Tower Art of the Neighborhood New" /><ref name="Koziarz 20192">{{cite web |last=Koziarz |first=Jay |date=July 16, 2019 |title=Cloud-like sculpture of 7,000 hanging disks floats above Willis Tower lobby |url=https://chicago.curbed.com/2019/7/16/20696661/willis-tower-renovation-art-jacob-hashimoto |access-date=September 7, 2022 |website=Curbed Chicago}}</ref> To honor Khan's contributions to skyscraper engineering design, the Structural Engineers Association of Illinois also commissioned a sculpture of him for the lobby of the Willis Tower.<ref>{{cite web |title=Fazlur Khan Sculpture |url=https://www.seaoi.org/history-past-presidents-khan-sculpture |access-date=February 25, 2014 |publisher=SEAOI}}</ref>

The commercial complex at the building's lowest stories is known as the Catalog, a reference to Sears' [[Mail order|mail-order catalogs]].<ref name="architecturalrecord.com" /><ref name="Selvam 2019">{{cite web |last=Selvam |first=Ashok |date=October 16, 2019 |title=Inside Willis Tower's $500 Million Renovation, Which Includes New Restaurants and a Food Hall |url=https://chicago.eater.com/2019/10/16/20914831/willis-tower-new-restaurants-food-walkthrough-catalog-eq-office-urbanspace-photos-images-food-hall |access-date=September 7, 2022 |website=Eater Chicago}}</ref> The six-story complex includes numerous restaurants.<ref name="Selvam 2019" /> It extends into three of the building's basement levels, as well as the three-story annex to the south and west of the tower.<ref name="architecturalrecord.com" /> The roof of the annex includes a curved [[skylight]] with 240 glass panes, and the northern section of the annex's roof is supported by black columns that resemble those in the original tower. The Catalog also contains decorative details, such as handrails and staircase landings, which are inspired by elements of Chicago's "built environment".<ref name="Koziarz 2019">{{cite web |last=Koziarz |first=Jay |date=October 15, 2019 |title=Checking in on Willis Tower's new retail and dining complex |url=https://chicago.curbed.com/2019/10/15/20914151/willis-tower-renovation-construction-retail-food-hall-catalog |access-date=September 7, 2022 |website=Curbed Chicago}}</ref> The third story of the Catalog contains a 30,000-square-foot [[coworking]] space operated by Convene.<ref name="Chicago YIMBY 2020" /><ref name="Koziarz 2019" />