{% set backaddressfile = backaddressfile|default("@d3PdfDocuments/documents/inc/page/returnaddress") %}
{% set addressfile = addressfile|default("@d3PdfDocuments/documents/inc/elements/recipientAddress") %}

<div class="addressarea">
    <div class="returnAddress">
        <div>
            {% include $backaddressfile %}
        </div>
    </div>
    <div class="recipientAddress">
        {% include $addressfile %}
    </div>
</div>