When discussing Italian building amnesties (condono edilizio) in Italy refers to three exceptional national laws introduced in the following years: 1985 - 1994 - 2003
These exceptional laws allowed certain irregularities that could not be remedied through ordinary procedures to be regularised, subject to their conditions and exclusions. The article cites the 2003 law, concerning works completed by 31 March 2003, with applications due by 31 December 2004. The ordinary application window is closed; specific auction-related provisions require separate legal assessment.  
What about property bought at auction?
The original article describes an exceptional application route, subject to statutory conditions, with a deadline of 120 days from the transfer of ownership. This is not an automatic entitlement for every auction purchase, and regularisation involves charges.

The article also discusses buildings dating from before 1942 and cadastral plans from 1939/1940, relating these to Italy's first national planning law. A property's age or cadastral plan alone does not conclusively establish lawful building status; the applicable historical rules and evidence must be assessed by a technical professional.

The transfer deed must contain the required declarations about building authorisations. Certain rules apply differently to buildings begun before 1 September 1967. This simplification does not itself prove planning compliance or remove the need to examine later alterations and regularisation procedures.

A property can, in some circumstances, be transferred despite planning irregularities, but a valid conveyance does not automatically resolve them. Depending on the case, consequences can include administrative or criminal proceedings, demolition orders or, in serious cases, acquisition by the municipality.

Before making an offer, ask a qualified technical professional to check planning and building compliance, which is different from cadastral compliance. Alternatively, obtain professional advice on making the offer conditional on satisfactory checks before the preliminary contract or completion.