modify class AgentPress_Listings to change the [property_details] shortcode and display data on 3 columns instead of 2

AgentPress_class-listings.php

class AgentPress_Listings {

	public $settings_field = 'agentpress_taxonomies';
	public $menu_page = 'register-taxonomies';

	/**
	 * Property details array.
	 */
	public $property_details;

	/**
	 * Construct Method.
	 */
	function __construct() {

		$this->property_details = apply_filters( 'agentpress_property_details', array(
			'col1' => array(
			    __( 'Price:', 'agentpress-listings' )   => '_listing_price',
			    __( 'Address:', 'agentpress-listings' ) => '_listing_address',
			    __( 'City:', 'agentpress-listings' )    => '_listing_city',
			    __( 'State:', 'agentpress-listings' )   => '_listing_state',
			    __( 'ZIP:', 'agentpress-listings' )     => '_listing_zip'
			),
			'col2' => array(
			    __( 'MLS #:', 'agentpress-listings' )       => '_listing_mls',
			    __( 'Square Feet:', 'agentpress-listings' ) => '_listing_sqft',
			    __( 'Bedrooms:', 'agentpress-listings' )    => '_listing_bedrooms',
			    __( 'Bathrooms:', 'agentpress-listings' )   => '_listing_bathrooms',
			    __( 'Basement:', 'agentpress-listings' )    => '_listing_basement'
			)
		) );

		add_action( 'init', array( $this, 'create_post_type' ) );

		add_filter( 'manage_edit-listing_columns', array( $this, 'columns_filter' ) );
		add_action( 'manage_posts_custom_column', array( $this, 'columns_data' ) );

		add_action( 'admin_menu', array( $this, 'register_meta_boxes' ), 5 );
		add_action( 'save_post', array( $this, 'metabox_save' ), 1, 2 );

		add_shortcode( 'property_details', array( $this, 'property_details_shortcode' ) );
		add_shortcode( 'property_map', array( $this, 'property_map_shortcode' ) );
		add_shortcode( 'property_video', array( $this, 'property_video_shortcode' ) );

		#add_action( 'admin_head', array( $this, 'admin_style' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'admin_js' ) );

		add_filter( 'search_template', array( $this, 'search_template' ) );

		add_filter( 'genesis_build_crumbs', array( $this, 'breadcrumbs' ), 10, 2 );

	}
}

functions.php

add_action('init', 'gc_extend_ap');
function gc_extend_ap() {
	if ( class_exists('AgentPress_Listings') ) {
		class My_AgentPress_Listings extends AgentPress_Listings {
			function __construct() {
				parent::__construct();
				remove_shortcode( 'property_details' );
				add_shortcode( 'property_details', array( $this, 'property_details_shortcode_3col' ) );
			}
			function property_details_shortcode_3col( $atts ) {

				global $post;

				$output = '';

				$output .= '<div class="property-details">';

				$output .= '<div class="property-details-col1 one-half first">';
					foreach ( (array) $this->property_details['col1'] as $label => $key ) {
						$output .= sprintf( '<b>%s</b> %s<br />', esc_html( $label ), esc_html( get_post_meta($post->ID, $key, true) ) );
					}
				$output .= '</div><div class="property-details-col2 one-half">';
					foreach ( (array) $this->property_details['col2'] as $label => $key ) {
						$output .= sprintf( '<b>%s</b> %s<br />', esc_html( $label ), esc_html( get_post_meta($post->ID, $key, true) ) );
					}
				//$output .= '</div><div class="clear">';
					//$output .= sprintf( '<p><b>%s</b><br /> %s</p></div>', __( 'Additional Features:', 'agentpress-listings' ), get_the_term_list( $post->ID, 'features', '', ', ', '' ) );
				$output .= '</div>';

				return $output;

			} // end property_details_shortcode_3col

		} //end class
		$gc_agentpress_listings = new My_AgentPress_Listings;
	}// end if
}