Fix #315: Prevent OSM valndalism on buildings

layers/building/building.sql

@@ -88,10 +88,11 @@ RETURNS TABLE(geometry geometry, osm_id bigint, render_height int, render_min_he
            ceil( COALESCE(height, levels*3.66,5))::int AS render_height,
            floor(COALESCE(min_height, min_level*3.66,0))::int AS render_min_height FROM
         osm_all_buildings
-        WHERE zoom_level >= 14 AND geometry && bbox
+        WHERE
+            levels < 1000 AND
+            zoom_level >= 14 AND geometry && bbox
     ) AS zoom_levels
     ORDER BY render_height ASC, ST_YMin(geometry) DESC;
 $$ LANGUAGE SQL IMMUTABLE;
 
 -- not handled: where a building outline covers building parts
-