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Revit API 里有个BuildingEnvelopeAnalyzer类，帮助文档里对它描述如下：
This class uses a combination of ray-casting and flood-fill algorithms in order to find the building elements that are exposed to the outside of the building. This method can also look for the bounding building elements for enclosed space volumes inside the building.
大概意思就是说这个类可以获取在建筑外面的建筑构件，
下面是一个小测试，
Document doc = commandData.Application.ActiveUIDocument.Document;
BuildingEnvelopeAnalyzerOptions opt = new BuildingEnvelopeAnalyzerOptions();
opt.AnalyzeEnclosedSpaceVolumes = true;
opt.OptimizeGridCellSize = false;
opt.GridCellSize = 1;
BuildingEnvelopeAnalyzer analyzer = BuildingEnvelopeAnalyzer.Create(doc, opt);
IList<LinkElementId> ids = analyzer.GetBoundingElements();
List<ElementId> nids = ids.Select(m => m.HostElementId).ToList();
UIDocument uidoc = new UIDocument(doc);
uidoc.Selection.SetElementIds(nids);
return Result.Succeeded;
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