Le Pilot:
If your company is leasing the "N" registered aircraft, perhaps
THIS regulation will answer your question. It describes the requirements to receive a "special purpose authorization" for foreign pilots to operate a US aircraft. If the aircraft is being exported from the US, it is a different matter. You might also find
THIS information on the FAA website useful in preparing the needed documentation. To speak with a live person,
THIS link will take you to the San Fransisco international field office website. There you will find telephone contact information. It appears that the SFO IFO is the office with responsibility for FAA matters in your area.
Good luck with your inquiry and please let me know what you find out.
Best regards,
Westhawk