code: private PropertyRecord getPropertyRecord(PropertyIdValue property) {
  		Integer id = getNumId(property.getId(), false);
  		if (!this.propertyRecords.containsKey(id)) {
  			PropertyRecord propertyRecord = new PropertyRecord();
  			this.propertyRecords.put(id, propertyRecord);
  			return propertyRecord;
  		} else {
  			return this.propertyRecords.get(id);
  		}
  	}
docs: Returns record where statistics about a property should be stored.
  
  @param property
  the property to initialize
  @return the property record