(ANSA) - Rome, July 26 - The definitive nod has been given for restoration works on Rome's Colosseum to begin on July 31 after two years of stalls. Rome Mayor Gianni Alemmano said at a Wednesday conference that it was "a great victory for Rome and culture". Works were delayed when consumer group Codacons challenged the private-sponsorship deal between the culture ministry and shoe king Diego Della Valle. The 25-million-euro contract covers the much-needed renovation of Rome's most famous monument, which will take 24-36 months to complete, involves restoring the north and south facades and the underground areas, and building a 1,600-square-meter reception area with a bookshop. In exchange, Della Valle's group will have exclusive rights to place their logo on a two-meter panel for 15 years. The Colosseum is close to 2,000 years old and hasn't had a much-needed facelift in 75 years.