gistfile1.txt

// assuming the id of the form is 'student'. If different change the filter name
add_filter( 'propertyhive_search_form_fields_after_student', 'edit_property_search_form_fields' );
function edit_property_search_form_fields($fields)
{
	$fields['_let_type']['value'] = X; // Where X is the Let Type set for Student properties
		
    return $fields; // return the fields
}