Created by artist Sheila Klein, it contains many iconic items from Milwaukee's DPW such as fire hydrants and the classic blue police call box.Designed to integrate private and public space, these curled terra cotta colored concrete strips flow through structural boundaries and provide seating at both ends.[citation needed] From the venue's opening until 2023, the southwest corner held an interactive art installation by Dick Blau titled "Polka Time![7] In December 2019, Eppstein Uhen Architects and tvsdesign were selected by the Wisconsin Center District to be the architecture team of the expansion project.[10] In February 2020, the Milwaukee Common Council granted the Wisconsin Center District Board approval to finance the planned $420 million expansion to the venue.[12] Plans are to pay off the bonds over a 40-year period, through Milwaukee County hotel, restaurant, and car rental taxes levied by the Wisconsin Center District, with debt payments beginning in 2027.[16] Designed by Eppstein Uhen Architects and tvsdesign, the expansion differs in architectural style from the existing structure, being more modern and glassy.[4] Other additions the expansion includes are an outdoor terrace, six additional loading docks, 400 new indoor parking spots, new public art, a second kitchen, [4][12] The expansion is being built atop land previously occupied by parking lots on the block of the convention center between West Wells Street and West Kilbourn Avenue.[citation needed] On August 15, 2012, Delta Air Lines purchased the building's naming rights as part of the carrier's recent expansion at Milwaukee's General Mitchell International Airport.