<select name="search:property_type">
    <option value="">Property type</option>
    {exp:low_list:each items="Apartment;House;Land" sep=";"}
      <option value="{key}"{if key == low_search_property_type} selected{/if}>
<a href="{low_search:url toggle:low_search_property_type="{low_search_property_type}"}">{key}</a>
      </option>
    {/exp:low_list:each}
</select>