Hi, I am not aware of any restrictions. I do know that if a business is buying a residence that it can only qualify for a commercial loan and not a residential mortgage.
If a foreign individual is buying a proprty they have to provide the appropriate visa.
If you have any other questions or would like to look at a particular property please give me a call or email. Cell is 603-930-7777 or email Scott.firstname.lastname@example.org