Use this plugin to display properties out of the backoffice Pararius Office on your website.
This plugin is an extension of the backoffice Pararius Office, which is used by real estate brokers to manage their properties. Via this plugin, a WordPress designer can display all the properties of that broker easily on his website. An API key is required for it to work, so it's no use for people who are no customer of Anno MMX. You also need to have JSON natively installed on your webserver. WordPress does offer a replacement for this, but it's way too slow
Check out http://www.parariusoffice.nl/website-bouwen for more documentation.