floor plan

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

• noun A scale diagram of a room or building drawn as if seen from above.

from The Century Dictionary.

• noun In architecture, a drawing which shows the plan of one story, especially with reference to those parts which are in connection with the floor rising out of it.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture A diagram, usually to scale, showing the layout of a building.
• noun electronics A layout representation of where the major functional blocks of an integrated circuit will be physically placed.

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

• noun scale drawing of a horizontal section through a building at a given level; contrasts with elevation