 While dominated by offices and public buildings, its residential population boomed during the latter 20th century and first decades of the 21st; its population has increased the most of Chicago's community areas since 1950.Some believe the origin of the term "Loop" is derived from the cable car, and especially those of two lines that shared a loop, constructed in 1882, bounded by Van Buren, Wabash, Wells, and Lake.Other research has concluded that "the Loop" was not used as a proper noun until after the 1895–97 construction of the Union elevated railway loop.