If you are talking about financing, there are restrictions placed on purchase (or loan amounts) based on the loan officer.

Generally, the laws get more restrictive as you get more local.

In the area where I have my SFR rental, laws restricts 3 or more unrelated people from renting a property.

Long term it gets complicated and also if you have heirs to inherit it there are many restrictions . look up Kareen hall and udirect .

If you've let these people utilized the land for a long period of time without restriction or legal documentation, you may have a long fight.

That being said, harder does not mean imposible. 

They have a lot of restrictions with rental vs. owner occupied and tend to be more competitive in the Boston market as they’re more price friendly for a first time home buyer.

@Nathan PlatterThe short answer is No, your friend cannot directly invest in U.S.A. real estate from within his RRSP.A self-directed RSP, with some restrictions, may write notes and hold mortgages for real property in Canada, but it cannot own property itself.FYI for Omar as well.

"On the other hand, there is no basis to conclude that Congress intended that an owner or manager of dwellings would be unable to restrict the number of occupants who could reside in a dwelling.

There is a deed restriction given in favor of an anchor tenant.