All the properties on BaseEstate.com are listed by external web sites. If you wish to find out more information or contact the seller of the property select the Contact tab on the properties detail page and click the link saying 'Originating Web Site'. From there you will be able to contact the person who listed the property.
If you go to the most recent newsletter you received from BaseEstate.com you will see a link at the bottom of it saying 'Stop sending me the BaseEstate.com newsletter'. Clicking on this link will cancel your newsletter subscription.
If you go to the most recent property alert email you received from BaseEstate.com you will see a link at the bottom of it saying 'Cancel this email alert'. Clicking on this link will stop the email being sent.
If you are an agent or broker you should use the Google Base API or Feed to load your listings. You can get more information here. If you are a private seller or wish to list your property independently of an agent or broker then you can find more information about the Base Estate property listing function here.