Add lettings fees textarea to property record

gistfile1.txt

// Add lettings fees box to property
add_action( 'propertyhive_property_residential_lettings_details_fields', 'add_lettings_fees_box_to_property' );
function add_lettings_fees_box_to_property()
{
    // Available Date
    propertyhive_wp_textarea_input( array( 
        'id' => '_lettings_fees', 
        'label' => __( 'Lettings Fees', 'propertyhive' ), 
        'desc_tip' => false
    ) );
}

// Save lettings fees entered on property
add_action( 'propertyhive_save_property_residential_lettings_details', 'save_property_lettings_fees' );
function save_property_lettings_fees($post_id)
{
    update_post_meta( $post_id, '_lettings_fees', $_POST['_lettings_fees'] );
}