Put offices in a specific order

gistfile1.txt

add_action( 'pre_get_posts', function( $query ) {

    if ( is_admin() || ! $query->is_main_query() ) {
        return;
    }

    // Adjust this condition if the plugin uses a shortcode/custom query.
    if ( $query->get( 'post_type' ) !== 'office' && ! is_post_type_archive( 'office' ) ) {
        return;
    }

    // LIST YOUR OFFICE IDS HERE IN THE ORDER YOU WANT
    $office_order = array(
        123,
        456,
        789,
        321,
    );

    $query->set( 'post_type', 'office' );
    $query->set( 'post__in', $office_order );
    $query->set( 'orderby', 'post__in' );
    $query->set( 'posts_per_page', -1 );

}, 99 );