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check_request_already_exist

// WP_Query arguments
$args = array(
	'post_type'              => array( 'request' ),
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'property',
			'value'   => '419',
		),
	),
);

// The Query
$req_query = new WP_Query( $args );