You can view instance parameters for a selected mass element in the Properties palette. Loadable mass families and in-place masses have the following instance parameters in common:
Mass Floors. Click Edit to open the Mass Floors dialog. The dialog displays all levels in the project. When you select levels, Revit generates a mass floor for each selected level that intersects the mass. After generating mass floors, the software calculates the mass floor area, perimeter, volume, and exterior surface area. See Creating Mass Floors.
When the mass changes its vertical extents, only previously selected levels that currently intersect the mass produce mass floors. Each previously selected level is retained even if it does not produce a mass floor until unselected.
Gross Volume. This value is read only.
Gross Surface Area. This value is read only. The gross surface area includes the sides, top, and bottom of the mass.
Gross Floor Area. This read-only value changes when you add mass floors.
Gross Volume, Gross Surface Area, and Gross Floor Area are all parameters that can be scheduled.