I found a few that are stated as SFH, but lists that they are in a senior community.

In our experience, rooming houses tend to serve very specific demographics, such as:students - we operate a rooming house which serves international students attending the local universities;{a specific} work force:  It is not uncommon to find rooming/boarding houses in close proximity to major employers (factories, hospitals, fish plants; etc);seniors:  A rooming/boarding house which serves seniors;the displaced & transient:  Rooming houses which serve those on the fringes of society (mental illness, transient, addictions).The population you serve will very much dictate the type of operation you will run and each comes with its own management challenges and rewards.My third question is, "Is this rooming house compliant with local zoning and bylaws?"  

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College students, seniors, sober living, or ?

I am a non-US citizen, living in the US.

I've never bought in a senior community.

What the Second Amendment protects citizens against is interference on the part of government (both federal and state government, as the McDonald case established) not private actors like landlords. 

If you ever have to go to a Peruvian court against a Peruvian citizen or entity, you might still lose even if you think you have the law on your side.In my not so old previous career as an international banker, I was lending hundreds of millions of dollars to Latin American (and European) banks (hence my competitive advantage in terms of knowledge and contacts when it comes to international investing).

I've heard stories of increases north of 50% due primarily to senior tax exemptions getting removed after the house is sold.

BC will always have a couple desirable areas but personally I’d stay away from the okanagen as it seems to be getting a little senior citizen heavy.