The US usage in reference to a location is simply a shortened form of student union building.
The first student union in America was Houston Hall, at the University of Pennsylvania, which opened January 2, 1896[1] and remains in operation to this day.
Subsequent additions, and renovations in 2010, have made the building one of the largest student activity centers in the world at 611,000 sq ft (56,800 m2).
The William Pitt Union was originally constructed in 1898 as a hotel and was converted into a student center in 1956.
[7][8] The Tivoli Student Union was originally home to the Trevoli Brewing Company but since has been converted to serve several institutions in Denver, Colorado.
[9] In 2007, the University of Vermont's student center became the first LEED Gold certification by the U.S. Green Building Council.
At Eastern Michigan University Student Center the building offers a kiva, a round, 360-degree room patterned after spaces used in Native American cultures.