I guess the bottom line is, if you are buying and like the area, you'll have to prioritize things like school district, taxes, etc. for the houses that you like.
http://www.city.pittsburgh.pa.us/cp/maps/regent_square.html seems to confirm the map, but that means that the city boundary is diagonal across all of those streets and that some houses must be on property that is properly in two different municipalities. Craziness!
So here's my followup question, then: if this is where 'Regent Square' is, what neighborhood is Savannah St in?
I hope that helps!