The Colonial Revival style appears here on a rather grand, pretentious (but likable) scale. The two-and-a-half-story brick structure with a gambrel roof boasts not one but three two-story porticoes; the entrance one is rectangular, while those on each gable end are semi-circular. Arched windows appear within the many gabled dormers. At the center of the gambrel roof is a large dormer with broken pediment and a version of a Palladian window within. Even larger Palladian windows tied by masonry to an upper oval window pop out of each gable end. The interior is organized around a cruciform reception hall, with each arm defined by a set of columns. Though good sized, the feel of the building is domestic, not institutional.
In 1989–1990 Alumni Hall was substantially remodeled and in part restored. The north, east, and west facades were restored, while a new curved stairway bay was added to the south facade. The interior was remodeled with larger, more open spaces. The general detailing of the remodeling and additions mirrors the original Colonial Revival appearance of the building.