diff --git a/src/building.js b/src/building.js
index 00a790d..c359e39 100644
--- a/src/building.js
+++ b/src/building.js
@@ -61,7 +61,7 @@ class Building {
       this.type = 'relation';
     }
     if (this.isValidData(outerElementXml)) {
-      this.buildNodeList();
+      this.nodelist = this.buildNodeList(this.fullXmlData);
       this.setHome();
       this.repositionNodes();
       if (this.type === 'way') {
@@ -98,8 +98,8 @@ class Building {
   /**
    * build an array of all the lat/long values of the nodes
    */
-  buildNodeList() {
-    const nodeElements = this.fullXmlData.getElementsByTagName('node');
+  static buildNodeList(fullXmlData) {
+    const nodeElements = fullXmlData.getElementsByTagName('node');
     let id = 0;
     var node;
     var coordinates = [];
@@ -111,7 +111,7 @@ class Building {
       coordinates = [node.getAttribute('lon'), node.getAttribute('lat')];
       nodeList[id] = coordinates;
     }
-    this.nodeList = nodeList;
+    return nodeList;
   }
 
   /**