Final answer:
The IMU was built in the collegiate gothic style, which is an architectural style commonly used in educational institutions.
Step-by-step explanation:
The IMU was built in the collegiate gothic style. The collegiate gothic style is an architectural style that emerged in the late 19th and early 20th centuries, characterized by the use of Gothic elements such as pointed arches, ribbed vaults, and flying buttresses. This style was commonly used in the construction of educational institutions, particularly colleges and universities, to evoke a sense of tradition and academic seriousness. Examples of collegiate gothic style buildings include the University of Chicago, Princeton University, and Yale University.