Detailed information regarding individual properties listed on the Derelict Sites Registers of specific local authorities is not available in my Department. Under the Derelict Sites Act 1990, local authorities are required to maintain a derelict sites register, which includes the name and address of each owner and occupier, where these can be ascertained by reasonable inquiry, of any land which, in the opinion of the local authority, is a derelict site. The register is kept at the offices of the local authority and is available for inspection at those offices during office hours.