Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 8135)
+++ trunk/data/validator/geometry.mapcss	(revision 8136)
@@ -64,4 +64,5 @@
 node[aeroway=apron],
 node[power=plant],
+node[building:part=yes],
 node[source:outline] {
   throwWarning: tr("{0} on a node. Should be drawn as an area.", "{0.tag}");