t.  The project structure whereby the Private Partner receives from the Contracting Authority an existing asset, may then upgrade, improve or rehabilitate that asset and then operate and maintain the asset to the agreed standard and subsequently transfers it back to the Contracting Authority after a specified period of time (typically somewhere between 00 and 00 years in the transport sector and 00 and 00 years for energy and waste/water). The Contracting Authority should carefully consider the quality of the asset it expects to receive back at the end of the term and how to ensure that the Private Partner ensures that the asset achieves that standard.  The project structure whereby the Private Partner receives from the Contracting Authority an existing asset, may then upgrade, improve or rehabilitate that asset and then operate and maintain the asset to the agreed standard and subsequently transfers it back to the Contracting Authority after a specified period of time (typically somewhere between 00 and 00 years in the transport sector and 00 and 00 years for energy and waste/water). The Contracting Authority should carefully consider the quality of the asset it expects to receive back at the end of the term and how to ensure that the Private Partner ensures that the asset achieves that standard.  The 