If as a pilot, you have the permit, you are then allowed to land outside of official airfields - that is what the permit is for. This can be at any private location, and all you need is written permission (normally faxed prior) from the owner of the property where you land. Assuming of course that it is not in restricted airspace. The written permission must state the pilot's name, the landing site, and the duration for which landing is allowed.
Hope this helps.