$tree->look_down( 'class', 'review-content' )

<div class="review-content">
  <div class="biz-rating biz-rating-very-large clearfix">
    <div itemprop="reviewRating" itemscope="itemscope" itemtype="http://schema.org/Rating">
      <div class="rating-very-large">
        <i class="star-img stars_4" title="4.0 star rating">
	  <img alt="4.0 star rating" class="offscreen" height="303" src="http://blah/v2/stars_map.png" width="84" />
        </i>
      </div>
    </div>
  </div>
</div>