1200 South Indiana

1200 South Indiana
File:1200 S Indiana, Vinoly's South Loop Tower in Chicago, Illinois.jpg
Former names	Grant Park Tower
General information
Status	Proposed
Type	Residential Tower
Architectural style	International
Location	South Loop, Chicago, Illinois
Completed	August 2018
Height	829 feet (253 m)
Technical details
Structural system	Bundled Tube, Shear Walls
Material	Steel, Concrete, Glass
Floor count	76
Floor area	1,190,978 sq ft
Lifts/elevators	12
Design and construction
Architect(s)	Rafael Viñoly
Developer	Crescent Heights
Other information
Number of units	795 residential units
Parking	520 spaces

1200 South Indiana (also Grant Park Tower or 113 E Roosevelt) is the name given to a skyscraper development project planned for the South Loop neighborhood of Chicago, Illinois. It is the first and only approved stage of what could be a two-stage project, consisting of two towers, with the second located just west of the first and reaching 30 feet taller. Once complete, the tower will be the 13th tallest building in Chicago, making it the tallest skyscraper in the South Loop and one of the tallest residential skyscrapers in the city.

Location & Usage

The tower will be located at the address its name suggests, 1200 S Indiana Avenue, in Chicago, Illinois. Its site is part of the South Loop area of Chicago, an informal neighborhood named for its proximity to the Chicago Loop, or the central business district that is encircled by the Chicago "L" tracks. The tower's proximity to the southwestern corner of Grant Park is intended to anchor the southern end of the Chicago skyline, and provide a boost in housing opportunities to the steadily-growing South Loop neighborhood.

The tower is a residential high-rise, with various amenities and retail scattered throughout. The first floor will house leasing offices, resident services, and retail spaces for future buildout. If the scope of the entire project is seen through, it will involve the construction of two towers. Currently, only the first tower is approved and underway, planned to house 795 residential units. Once both phases are complete, the towers will house over 1200 residential units. In addition to its influx of housing availability in the South Loop, the project will also create plentiful job opportunities, as it is currently projected to require more than one million man hours of work during its 24-month construction timeline.

Once complete, it will also be responsible for approximately 50 full-time permanent jobs, including leasing personnel, amenity and maintenance staff, and ground-floor retail employees. The tower will also offer 520 parking spaces to its residents, as well as full amenities decks, and indoor/outdoor pool, green roofs and gardens, barbecue areas, fitness rooms, and private balconies for most of the units.

Design

Style

The tower was created by Rafael Viñoly and his firm, Rafael Viñoly Architects, who also designed the University of Chicago's Booth School of Business in Hyde Park.

Its design reflects the International style, made famous in the 1950s by Ludwig Mies van der Rohe. Although not clad in cold-rolled aluminum and black-tinted glazing like other examples of the International style in the city, 1200 S Indiana nonetheless maintains the style through its form. While the goal was to create a memorable tower, Viñoly aimed to avoid a design that may age poorly, stating that "iconic buildings are buildings that look weird." The compromise was 1200 S Indiana, intended to be a landmark for the southern end of Grant Park while showing respect to Chicago's architectural legacy.

At 829 feet, 1200 S Indiana will be the 13th tallest building in Chicago, and the second tallest all residential tower in the city, behind the 843-foot, 69-story One Bennett Park in Streeterville.

Structure

According to Viñoly, the project pays homage to the Willis Tower (formerly the Sears Tower) by using the same bundled tube structural system that was first implemented by engineer Fazlur Khan. Such a structure was created for and used readily in many Chicago buildings during the late 1960s and early 1970s, including the Willis Tower, John Hancock Center, One Magnificent Mile, and the Plaza on DeWitt. Because of this, much of the building's overall form resembles the Willis Tower as well.

File:1200 S Indiana, Phase Two, Chicago, Illinois.jpg

A render showing both phases of the proposed tower (Phase II appears grayed out)

In tandem with the bundled tube system, the structure will also employ shear walls to stabilize the tower's slender multi-level "tubes." The bundled tube structure alone provides vertical strength - that is to say, the bundled tubes act as columns, carrying large loads of weight straight down, but are unable to resist lateral loads. The shear walls act as horizontal bracing, with effects similar to those of William LeBaron Jenney's cross bracing or X-bracing that allowed for the first skyscrapers to be constructed in Chicago. The walls tie into the central core of the tower. As lateral load is applied to the building (such as wind, snow and rain), the shear walls resist the load and transfer it deeper into the building to the core. The core then carries the load down to the bedrock at the foundation.

To stabilize its height further, the tower will also feature a tuned mass damper on the 77th floor. The force of wind against tall buildings can cause the top of skyscrapers to move more than a meter. This motion can be in the form of swaying or twisting, and can cause the upper floors of such buildings to move more than is usually desired by high-rise occupants. Due to the square shape of 1200 S Indiana, wind will hit the facade more abruptly. A mass damper system will counteract this swaying by placing a large mass (in this case, a metal and concrete ball) center upon several pneumatic and hydraulic pistons that move the mass in the opposite direction of the building's swaying motion. As wind shifts the building a few inches to the left, for example, pistons move the mass a few inches to the right to counteract the swaying and re-center the tower.

The project was originally conceived of as three phases: two towers and a set of small, low-rise condominiums. However, the condominium phase has been ignored for the time being, and focus has been placed on the two towers. Currently, only the first phase (and subsequently the first tower) has been approved, and will be at the corner of S Indiana Avenue and E Roosevelt Road. If the second phase of the project is seen through and approved, a second tower similar to the first but slightly taller will be placed just west of the first tower, at the corner of S Wabash Avenue and E Roosevelt Road. Early renders of the project show the two towers together, however currently only the first tower is officially announced.

Sustainability

Following precedents set by other residential and commercial high-rises in Chicago, as well as by demands and suggestions of city ordinances, the proposed development will be LEED certified, with the tower attempting a LEED Silver level of certification. It will employ a variety of strategies, including water-efficient and low-flow water fixtures for both residents and public spaces, energy saving lighting and lighting control systems, regionally-sourced and recycled materials, low-emitting finishes and paints with low- or zero-VOCs, and the purchase of green power.