Infrastructure Lifecycle Management (ILM) is a term coined by the real estate

Real estate

In general use, esp. North American, 'real estate' is taken to mean "Property consisting of land and the buildings on it, along with its natural resources such as crops, minerals, or water; immovable property of this nature; an interest vested in this; an item of real property; buildings or...

 sector. It covers the management of all core processes around planning, construction, operation, maintenance and commercialization of buildings or property. The life cycle of a real estate property starts with the planning and realization phase, carries on with the commercial usage and facility management

Facility management

Facility management is an interdisciplinary field primarily devoted to the maintenance and care of commercial or institutional buildings, such as hospitals, hotels, office complexes, arenas, schools or convention centers...

and is finalized by the demolition, dismantling or conversion of the property.