listing objects in a html file

This file is used to print out the name of the premises with an update link , however I wanted to add a list of premises with the in_use flag set to false. 

Can anyone tell me what I am doing wrong?

{% extends "base.html" %}

{% block content %}

<h2>Premises</h2>

<ul>

{% unusedpremises = [] %}

{% for premises in object_list %}

{% if premises.in_use %}

<li>{{ premises.name }} <a href ="premuv/{{premises.id}}/"> Update  </a> &nbsp    </li>

{% else unusedpremises.add(premises) %}

{% endif %}

{% endfor %}

</ul>

<h3>Unused Premises</h3>

<ul>

{% for premises in unusedpremises %}

<li>{{ premises.name }} <a href ="premuv/{{premises.id}}/"> Update </a> %nbsp </li>

{% endif %}

{% endfor %}

</ul>

{% endblock %}

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