Results Communities by Offices

// WP_Query arguments
$args = array(
	'post_type'              => array( 'community' ),
	'meta_query'             => array(
		'relation' => 'OR',
		array(
			'key'     => 'meta_community_settings_office',
			'value'   => 'Office1',
		),
		array(
			'key'     => 'meta_community_settings_office',
			'value'   => 'Office2',
		),
	),
);

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