The work to repair and secure the Garisenda tower will run until June 2026, said Culture Undersecretary Lucia Borgonzoni.
The Garsenda is one of two towers standing side by side in the heart of Bologna, and symbols of the Emilian capital.
The 48-metre-high Garisenda, which stands alongside the 97 metre high - and straight - Torre degli Asinelli in the ancient heart of Bologna, is in a worrying state of stability, Borgonzoni said in October.
ANSA