IOWA CITY — Bucking expectations, the University of Iowa for the first time in three years has more students wanting to live in its residence halls than it has room for — forcing 100-plus students into “expanded housing,” which involves six to eight residents sharing space in a residence hall lounge.This fall’s overcapacity quandary is the university’s first since 2017, when it added more than 1,000 beds to the east side of campus with the new 12-floor, 303,000-square-foot Elizabeth Catlett Residence Hall.