SETI: Livable Dish
A thousand-year communications project supported by its own city.
When asked to think about a buildings that might last 1000 years, Tom came back with a quest rather than a structure.
Taking inspiration from the Clock of the Long Now, Tom investigated long and slow communication systems.
If we were to find alien life forms it would take us 1000 years to be able to communicate with them via the SETI project. Thus the proposal for a city as living support for a technology system.