I'm new to the Revit API, and I would like to experiment with a sheet to get the cost property of a simple sheet that has 4 walls:
Do you know if doing this using the Revit API is possible? My idea is to get all property cost for any element in a sheet (Walls, windows, doors, etc).


Definitely possible. Probably the cost value is stored in a
Parameteron a Revit databaseElement. You can use RevitLookup and other database exploration tools to view, navigate and explore the BIM element parameters, properties and relationships to find out how to access it programmatically.