SoHo, an acronym for "South of Houston Street", is a section located in Lower Manhattan. For most of the 20th century, the area remained a relatively quiet manufacturing district; its last important change of style happened in the 1960s, when artists took advantage of tall ceilings and many windows of the abandoned manufacturing lofts. By the 1970s, it was already one of the most modern neighborhoods in Manhattan. Today, SoHo is known for its eclectic mix of shops, world class art galleries, dining and some of the most sought after real estate. Distinguished landmark architecture, aside from the approximately 250 cast iron buildings, include The Little Singer Building on Broadway, and New York's most peculiar subway map, an 87-foot long work of art comprised of concrete rods embedded in the sidewalk.