Pseudo variables in standard codeigniter template variables: http://www.codeigniter.com/user_guide/libraries/parser.html
This is instructions:
{last_estates} {/last_estates}
Should be changed to this:
<?php foreach($last_estates as $item): ?> <?php endforeach(); ?>
And variables inside like:
{thumbnail_url}
Should be changed to:
<?php echo $item['thumbnail_url']; ?>
This for example:
{has_option_36} {/has_option_36}
to:
<?php if(empty($item['option_36'])): ?> <?php endif; ?>
To be hanest, I will change all pseudo variables in future to real PHP variables because cause only problems when somebody like you want to customize something, format something differently etc…