Home Insurance Building
The Home Insurance Building was a skyscraper that stood in Chicago from 1885 to 1931. Originally ten stories and tall, it was designed by William Le Baron Jenney in 1884 and completed the next year. Two floors were added in 1891, bringing its now finished height to . It was the first tall building to be supported both inside and outside by a fireproof structural steel frame, though it also included reinforced concrete. It is considered the world's first skyscraper. The building opened in 1885 and was demolished 46 years later in 1931. History. The building was  designed in 1884 by Jenney for the Home Insurance Company. Construction began on May 1, 1884. Because of the building's unique architecture and weight-bearing frame, it is considered one of the world's first skyscrapers. It had 10 stories and rose to a height of ; two additional floors were added in 1891, bring the total to 12 floors, an unprecedent height at the time. The building weighed one-third as much as a masonry building and city officials were so concerned they halted construction while they investigated its safety. Demolition and replacement. In April 1929 the building was  reported as having a 90 percent occupancy rate, compared to an occupancy rate of the surrounding financial district estimated at 96 percent or more. In September 1929 plans were made by Marshall Field's to construct a large office building spanning Adams, Clark, and LaSalle Streets. This building would be constructed and opened in parts, the first part occupying the western part of the lot and the site of the Home Insurance Building. All told six buildings were demolished to make way for the Field Building, including the Home Insurance Building. In 1932, owners placed a plaque in the southwest  section of the lobby reading: This section of the Field Building is erected on the site of the Home Insurance Building, which structure, designed and built in eighteen hundred and eighty four by the late William Le Baron Jenney, was the first high building to utilize as the basic principle of its design the method known as skeleton construction and, being a primal influence in the acceptance of this principle was the true father of the skyscraper, 1932. Status as first skyscraper. The Home Insurance Building in Chicago is often considered the world's first skyscraper due to both its  design and height,; the building was supported using an iron frame skeleton. It was one of the earliest buildings to use an iron frame skeleton and the tallest to ever do so at the time, rising to ten stories; with an additional two stories added. It was the first multistory building in the United States to largely use iron in its exterior to support the masonry since Badger had constructed similar grain elevators between 1860 and 1862. The status of the Home Insurance Building as the first skyscraper had been accorded by the time of its centennial in 1985. The  Chicago press at the time of its construction did not refer to it as the first skyscraper in Chicago. An 1884 list of buildings considered skyscrapers in Chicago listed three buildings in the city whose final heights would be taller than the Home Insurance Building's, although the Home Insurance Building was completed in 1885, a year after the list. Iron framing of multistory buildings had originated in England in the late 18th century and was able to replace exterior load-bearing walls by 1844, but social movements and legal regulations hindered their use at that time. An example is  the Ditherington Flax Mill in England, but it was only five stories tall. The Broad Street Station in Philadelphia, a six-story building designed by Wilson Brothers & Company built in 1881, had a structural steel frame and was one of the first buildings in America to use masonry not as structure, but as curtain wall. But at only six stories, it was not considered the world's first skyscraper. Chicago and New York each had some lower height structures using iron framing, but they were not fireproof. Later buildings in Chicago were able to solve these problems by supporting the  external masonry entirely on the iron frame, which later became the standard worldwide. Peter B. Wright had constructed such a column in Chicago in 1874. Leroy Buffington of Minneapolis developed a system of using wrought iron to frame buildings. However, the design of the Home Insurance Building, supporting the external masonry entirely on the iron frame, was used more by architects worldwide. Buffington later patented his wrought iron to frame design in 1888, but the "Chicago school of architecture" had already begun. Other tall structures completed before the external masonry to iron frame style included the 1882 Montauk Building (also  in Chicago) and the 1870 Equitable Life Building in New York. There were also a few other buildings in New York and Chicago of similar height with different architectural designs, however.