Revit :: Moving Model To New Vertical Elevation?

My problem is trying to move the project model to a new elevation some 1000+ feet higher than the 0'0" schematic design elevation. When using the "shared" solution, it will work for the model but not for the Topo as the topo is also tied to the Project base point, so when one uses shared it also moves the topo map 1000+ feet higher. I'm trying to find a way where the project elevation can be adjusted to the base point elevation so both topo and model elevations coordinate with each other. It's a 4 level project with many exterior retaining wall levels. I'm almost to the point of doing a full copy of the project to the clipboard and then importing it at the level 1000+ feet higher.