Homes being purchased for assisted living use...

So i learned today that the home next to me was purchased to be rented for assisted living and end of life care purposes.

I didn't even realize this was a thing until now but raises a ton of questions in my mind.

I assume this explains the high rental price somewhat as im guessing that medicare/medicaid covers it.

The problem I've seen so far is traffic, with nurses parking on the street and emergency services showing up too.

I wonder, do they not require permits from the city, state or county?

Doesn't operating a business violate some HOA thing?

How are they getting away with doing this....