Nested Test

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'beds',
		'value'   => 'intval($bedrooms)',
		'compare' => '>=',
		'type'    => 'NUMERIC',
	),
	array(
		'relation' => 'OR',
		array(
			'key'     => 'prop_id',
			'value'   => 'array()',
			'compare' => '=',
		),
		array(
			'key'     => 'prop_id',
			'value'   => 'array()',
			'compare' => 'NOT IN',
		),
	),
);