Instead of changing the field (which is hard) you could use a non-db field and a logic hook.
$dictionary['lx_buildings']['fields']['myField'] = array(
'vname' => 'LBL_MYFIELD',
'studio' => 'visible',
'required' => false,
'name' => 'myField',
'labelValue' => 'Arq Status',
'type' => 'text',
'size' => '20',
'rows' => '6',
'cols' => '80',
'source' => 'non-db',
'inline_edit' => '0',
);
After the field definition you can add a Logic Hook in the module file named logic_hooks.php
$hook_array['after_retrieve'][] = Array(101, 'myLH', 'custom/modules/MOD/logic_hooks_after_retrieve.php','MyLH', 'MyLHFunc');
Finally the LH code you can set any HTML you want
public function MyLHFunc($bean, $event, $arguments)
{
$bean->$myField = '<div class="container">Custom HTML Field</div>';
}