What are the principal advantages of using a single building information model of the existing conditions as the foundation for modeling proposed additions or renovations?

• You can have the complete life cycle of the project in one model. Making it in some degree a 4D simulation.

What sort of complexities are introduced when you construct a building complex in phases?

• You have to be aware of the selected phase of each plan, view or element.

What are the principal advantages of using a single building information model of the existing conditions as the foundation for modeling several proposed design alternatives for a portion of the building?

• You can present the model to your clients and show them the alternatives.