Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 9958)
+++ trunk/data/validator/geometry.mapcss	(revision 9985)
@@ -239,2 +239,7 @@
   fixAdd: "place=islet";
 }
+
+/* 12561 - building larger than Aalsmeer Flower Auction */
+area:closed[building][eval(areasize()) > 500000] {
+  throwWarning: tr("Too large building");
+}