About Area Type Rules

Rules are determined by one type of space bordering another space.

The following table shows area measurement rules. To find the appropriate measurement rule, find the selected Area Type and the corresponding Bordering Area Type.

Gross Building Area Scheme Types

Gross Building Area Scheme Types
Area Type Selected	Bordering Area Type	Measurement Rule
Gross Building Area
Gross Building Area	None	Area Boundary measured to the outside surface of building.
Gross Building Area	Exterior Area	Area Boundary measured from outside surface of building.
Exterior Area
Exterior Area	Exterior Area	Area Boundary measured from wall centerline.
Exterior Area	Gross Building Area	Area Boundary measured from outside surface of building.

Rentable Area Scheme Types

Note: Windows in Rentable Area Scheme Types: If you place windows within the exterior walls, Revit LT places the area boundary lines according to the following rules based on the height of the windows: If window height is greater than 50% of wall height, area boundary lines go to face of glass. If window height is less than 50% of wall height, area boundary lines go to interior face of the exterior walls.

Rentable Area Scheme Types
Area Type Selected	Bordering Area Type	Measurement Rule
Building Common Area
Building Common Area	Building Common Area, Office, Store	Area Boundary measured from wall centerline.
Building Common Area	Exterior, Major Vertical Penetration	Area Boundary measured from wall face bordering Building Common Area.
Office Area
Office Area	Building Common Area, Office, Store	Area Boundary measured from wall centerline.
Office Area	Exterior, Major Vertical Penetration	Area Boundary measured from wall face bordering the office area.
Exterior Area
Exterior Area	Exterior	Area Boundary measured from wall centerline.
Exterior Area	Store	Area Boundary measured from wall face bordering Exterior Area.
Exterior Area	Any other areas	Area Boundary measured from the wall face bordering the other area.
Floor Area
Floor Area	Office, Store or Building Common Area	Area Boundary measured from wall face bordering other area.
Floor Area	Exterior, Major Vertical Penetration	Area Boundary measured from the wall face bordering the floor area.
Floor Area	Floor Area	Area Boundary measured from the wall centerline.
Major Vertical Penetration
Major Vertical Penetration	Major Vertical Penetration	Area Boundary measured from the wall centerline.
Major Vertical Penetration	Exterior	Area Boundary measured from the wall face bordering the Major Vertical Penetration area.
Major Vertical Penetration	Any other area (except Exterior)	Area Boundary measured from the wall face bordering the other area.
Store Area
Store Area	Major Vertical Penetration, Floor	Area Boundary measured from the wall face bordering the Store area.
Store Area	Exterior	Area Boundary measured from the wall face bordering the Exterior area.
Store Area	Building Common Area, Office, Store	Area Boundary measured from the wall centerline.