Custom metabox not displaying multiselect data in edit mode

I tested your code and this ended up working for me:

case 'multiselect':  
  echo '<select name="'.$field['id'].'" id="'.$field['id'].'">';  
     foreach ($field['options'] as $option) {  
            echo '<option', $meta == $option['value'] ? ' selected="selected"' : '', ' value="'.$option['value'].'">'.$option['label'].'</option>';  }  
            echo '</select><br /><span class="description">'.$field['desc'].'</span>';  
break; 

For the Field Array
I just added another option with a blank value and a label of “Select”.
Also, I removed an extra “;” on the second to last line.

$prefix = 'sysout_';
$outage_meta_fields = array(
    array(
        'label' => 'Buildings Affected',
        'desc' => 'Select the buildings affected',
        'id' => $prefix.'buildings',
        'type' => 'multiselect',
        'options' => array(
            'Select' => array(
                'label' => 'Select',
                'value' => ''
            ),
            'building1' => array(
                'label' => 'Building 1',
                'value' => 'building1'
            ),
            'building2' => array(
                'label' => 'Building 2',
                'value' => 'building2' //This continues for a while
            )
        )
    )
);