get posts from selected taxonomy

1$posts_array = get_posts(
2    array(
3        'posts_per_page' => -1,
4        'post_type' => 'fabric_building',
5        'tax_query' => array(
6            array(
7                'taxonomy' => 'fabric_building_types',
8                'field' => 'term_id',
9                'terms' => $cat->term_id,
10            )
11        )
12    )
13);