ground plan

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A plan of a floor of a building drawn as if seen from overhead.
• noun A preliminary plan or strategy.

from The Century Dictionary.

• noun In architecture, the representation of the divisions of a building at the level of the surface of the ground; commonly, the plan of the lowest story above the cellar, though this is usually raised above the surface of the ground. Also ground-plot. Hence — 2. A first, general, or fundamental plan of any kind.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a floor plan for the ground level of a building