The places you can not photograph even if public property are the places a reasonable expectation of privacy is warranted. Restrooms, changing rooms, dressing rooms, showers, baths, etc.
The places a person with common sense and decency wouldn't take a camera anyhow.
To create a real estate portfolio, shoot your house, friends houses, and those of family.
I did RE for a while and found agents don't know the difference between good and bad photos and don't care, for the most part. They want sales, not additional costs.
If you find one that does care, see if you can work with them on a contingency basis to form a relationship and trust and soon they'll be sending you around town for assignments.