We had a problem where we had imported some sites that were pretty spread out - so when my using maximized his levels to 3D extents, they went WAAAAY off in space. After a half hour of stretching the grips, it started to get pretty frustrating, so I did what I should always be doing - go to the Autodesk support discussion groups (support.autodesk.com). I found this solution from Cliff B. Collins, a Registered Architect/BIM Manager at Thalden Boyd Emery Architects in St. Louis, MO .....on the Revit Architecture page...go figure, an MEP guy looking to the architect page for help (thanks and kudos to Cliff, BTW).
He recommending using scope boxes to limit the extents of the datum levels. You'll need to do this in the file that the original levels are placed (in our case, the architectural model) From the view tab, pick the scope box tool: