The University of Sheffield's students' union has reopened after a £5m revamp.
The building on Western Bank includes music venues, bars, restaurants and shops and employs more than 900 people.
Construction work on the revamp began in November and included the creation of a new entrance and activity zone, where students can exhibit their work.
The university said the students' union was a "major factor" in attracting students to the city and it described the new building as "wonderful".
The building's last major project was the addition of a 400-seat lecture theatre, study space and meeting rooms in the early 1990s.
Students, staff and local residents can use the building's facilities.
Vice-chancellor Keith Burnett said: "The students' union is an invaluable resource for both students and staff and with even more top-class facilities to suit our diverse student body, I am sure the students' union will retain its position as one of the best in the country."