I park behind the bus pickup & dropoff station if I'm to be more than a day. I try to park unobtrusively if I can when I'm gone for a while. And yes indeed it's free.
No parking fee here
You can park up to 30 days if needed. This bus goes to South station then Logan airport so if your traveling this would be a good way to get to the city and back and not worry about parking fees.
No fee
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