Green Buildings and Smart Buildings are complementary and in some areas overlap.
The green buildings have numerous certification processes that define or shape the energy efficient and sustainable building and provide guidance to the design team. The smart building certification process doesn't require as many procedures as a green building does.
The smart buildings operation capabilities:
1. Multi-system integration that provides enhanced functionality for a building
2. Integration of data from several building systems, business tools, facility management systems and exterior data
3. Analysis of building data and the creation of metrics in order to measure and monitor building performance against benchmarks or established goals
4. Advanced building management platforms with the capability to deploy real-time system analytics and do so on an enterprise basis, remotely and covering an entire portfolio of buildings
More on: http://www.smart-buildings.com/uploads/1/1/4/3/11439474/bacnet_journal.pdf