Modify instance properties to change a ceiling's level and offset, slope, and more.
To change instance properties, select the element and change its properties on the Properties palette.
| Name | Description | 
|---|---|
| Constraints | |
| Level | Indicates the level on which this instance is placed. | 
| Height Offset From Level | Specifies the distance this instance is offset relative to the specified level. | 
| Room Bounding | Specifies whether this instance is used to define the extents of a room.See Room Boundaries. | 
| Dimensions | |
| Slope | Specifies the rise-to-run slope value if the slope has been defined by a boundary sketch line or slope arrow. | 
| Perimeter | The computed perimeter of this instance. (Read-only) | 
| Area | The computed area of this instance. (Read-only) | 
| Volume | The computed volume of this instance. (Read-only) | 
| Identity Data | |
| Comments | Displays a comment that you enter or select from the drop-down list. Once entered, a comment can be selected for other instances of elements in the same category, regardless of type or family. | 
| Mark | Identifies or enumerates a particular instance as specified by the user. Revit warns you if the number is already used but allows you to continue using it. | 
| Phasing | |
| Phase Created | Specifies the phase when this instance was created. | 
| Phase Demolished | Specifies the phase when this instance was demolished. |