1. Basic and usually permanent framework which supports a superstructure and is supported by asubstructure. 
2. Relatively permanent and foundational capital investment of a country, firm, or project that underlies and makes possible all its economic activity. It includes administrative, telecommunications, transportation, utilities, and waste removal and processing facilities. Some ... Read more

USAGE EXAMPLE

Urban infrastructure in parts of New York City include the Empire State Building, the Trump Tower, and every building and road in between that is useful to the average citizen living there.