Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual page 1036

For example, suppose a room starts at Level 1. To indicate that it should extend upward 4000 mm above
Level 2, specify an Upper Limit of Level 2 and a Limit Offset of 4000 mm. By default, the Limit Offset is the
distance between levels (10 or 4000 mm).
In the following section view:
Room 1 has an Upper Limit of Level 1 and a Limit Offset of 4000.
Room 2 has an Upper Limit of Level 1 and a Limit Offset of 3000.
Room 3 has an Upper Limit of Level 2 and a Limit Offset of 4000.
Room 4 has an Upper Limit of Level 2 and a Limit Offset of 3500.
Defining the Lower Boundary of a Room
Together, the Level and Base Offset parameters define the lower boundary of a room.
In the room properties, the Level parameter is read-only. This parameter reflects the level of the plan view
in which you place the room. For example, if you place a room on a Level 2 floor plan, the Level parameter
for the room is Level 2.
Use the Base Offset parameter to indicate the distance between the base level and the lower boundary of
the room. To use the base level as the lower boundary, enter 0 (zero). To move the lower boundary above
the base level, enter a positive number. To move the lower boundary below the base level, enter a negative
number.
For example, in the following section view:
Room 1 has a Base Offset of 0. The lower boundary of the room starts at Level 1.
Room 2 has a Base Offset of 1000. The lower boundary of the room starts 1000 mm above Level 1.
Room 3 has a Base Offset of –500. The lower boundary of the room starts 500 mm below Level 1.
994 | Chapter 16 Rooms and Areas