Index: trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(revision 6303)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/OverlappingWays.java	(revision 6304)
@@ -61,5 +61,6 @@
                 || p.get("amenity") != null
                 || p.get("leisure") != null
-                || p.get("building") != null;
+                || p.get("building") != null
+                || p.get("building:part") != null;
     }