function tall_homes_override( $template ) {
    global $wp_query;
    $post_type = get_query_var( 'post_type' );

    if ( $wp_query->is_single && $post_type == 'tall_homes' ) {
        return locate_template( 'single.php' );
    }
    return $template
}
add_filter( 'template_include', 'tall_homes_override' );