Marina City, Chicago, US

Marina City is a mixed-use residential/commercial building complex occupying an entire city block on State Street in Chicago, Illinois. It lies on the north bank of the Chicago River. The complex consists of two corncob-shaped 65-story (including 5-story elevator & physical plant penthouse), 587 foot (179 m) tall residential towers, a saddle-shaped auditorium building, and a mid-rise hotel building all contained on a raised platform cantilevered over defunct railroad tracks adjacent to the river. Beneath the raised platform at river level is a small marina for pleasure craft.

It was completed in 1964 at a cost of $36 million financed to a large extent by the union of building janitors and elevator operators, who sought to reverse the pattern of "white flight" from the city's downtown area. When finished, the two towers were both the tallest residential buildings and the tallest reinforced concrete structures in the world. The complex was billed as a "city within a city", featuring numerous on-site facilities including a theatre, gym, swimming pool, ice rink, bowling alley, several stores and restaurants, and of course, a marina.

The two towers contain identical floor plans. The bottom 19 floors form an exposed spiral parking ramp operated by valet with 896 parking spaces per building. The 20th floor of each contains a laundry room with panoramic views of the Loop, while floors 21 through 60 contain apartments (450 per tower). A 360-degree open-air roof deck lies on the 61st and top story. The buildings are accessed from separate lobbies that share a common below-grade mezzanine level as well as ground-level plaza entrances.

Marina City apartments are unique in containing almost no interior right angles. On each residential floor, a circular hallway surrounds the elevator core, which is 32 feet (10 m) in diameter, with 16 pie-shaped wedges arrayed around the hallway. Apartments are composed of these triangular wedges. Bathrooms and kitchens are located nearer to the "point" of each wedge, towards the inside of the building. Living areas occupy the outermost areas of each wedge. Each wedge terminates in a 175-square-foot (16.3 square meter) semi-circular balcony, separated from living areas by a floor-to-ceiling window wall. Because of this arrangement, every single living room and bedroom in Marina City has a balcony.

Architect : Bertrand Goldberg