Rome, January 17 - Delays in restoration work at Rome's Colosseum are becoming "exasperating," the city's mayor complained Thursday. Gianni Alemanno said he realized that it was important to listen to all stakeholders involved in preserving and protecting the historic monument, properly named the Flavian Amphitheatre. But repeated delays have become ridiculous and threaten the structure's future, he said. "The continuous postponements of work on the restoration of the Colosseum are becoming exasperating," he said. He spoke after it was revealed that the regional council of Lazio, where Rome is located, has delayed until January 31 a decision on a dispute over tenders for part of the construction work. Plans for a 20-million-euro major restoration of the 2,000-year-old Colosseum have overcome a lengthy series of legal challenges and the work to be funded by Tod's shoe magnate Diego Della Valle is scheduled to start soon. In the meantime, a security zone has been erected around the Colosseum to protect both the monument and passers-by as chunks of plaster have fallen from its highest arcade.