When I tried to create this I wasn't sure I was doing it correctly.
This is a small standalone structure, a public restroom. Not sure if it is free.
I'm used to seeing these in tourist locations, which this isn't. It has ads on the sides, like they have at bus stops.

This looks like gas pumps, for the police vehicles.

Unable to answer "Do these traffic lights have a tactile indication for blind people for when it’s safe to cross?" – Crossing With Pedestrian Signals – node/12122565971 via StreetComplete 61.2:

I've never understood what this means.

This bike lane continues up Ruggles Street

Unable to answer "What kind of building is this?" for way/644451367 via StreetComplete 55.1:

I think this is a gasoline station for the police cars.

Most of this lot is owned by the Boston Public Schools, and is used for employee parking.

This is located on the sidewalk, not inside this lot. But it's close enough I guess.

Unable to answer "Is there a shelter at this stop?" for node/1399798649 via StreetComplete 55.1:

No bus stop here

Unable to answer "Is there a shelter at this stop?" for node/1399798649 via StreetComplete 55.1:

No bus stop here

Unable to answer "Is there a bench at this stop?" for node/1399797801 via StreetComplete 55.1:

There is no bus stop there.
The closest one is just South on the other side of the intersection