<?php

  $terms = wp_get_post_terms( $post->ID, 'plan type' );
  if($terms){
    // post has course_type terms attached
    $course_terms = array();
    foreach ($terms as $term){
    $course_terms[] = $term->slug;
  }

  $original_query = $wp_query;
  $wp_query = null;
  $wp_query = new WP_Query( array(
   'post_type' => 'floorplans',
   'tax_query' => array(
      array(
       'taxonomy' => 'plan type',
       'field' => 'slug',
       'terms' => $course_terms, //the taxonomy terms I'd like to dynamically query
        'posts_per_page' => '-1',
       ),
      ),
        'orderby' => 'title',
        'order' => 'ASC',
        'posts_per_page' => '-1',
      ));

  if ( have_posts() ): ?>
      <ul class="gallery_list cf">
     <?php
       while (have_posts() ) : the_post();
       $thumb = get_field('floorThumb');
     ?>
     <li>
       <a href="<?php the_permalink(); ?>">
         <div class="gallery_thumb">
            <img src="<?php echo $thumb['url']; ?>" alt="<?php echo $thumb['alt']; ?>">
         </div>
         <div class="overlay"></div>
         <h2><?php the_title(); ?></h2>
       </a>
    </li>
    <?php endwhile; ?>
    </ul>
  <?php endif;
      $wp_query = null;
      $wp_query = $original_query;
      wp_reset_postdata();
  } // end if($terms)
} ?>