How close is Boston south station and is this the closest train station to the building

Government Station, Blue Line ... Hay Market Station, Green & Orange Lines

Hey market is close

Government Center 2 min walk.

Hay Market Station

If you mean commuter rail, North Station is closer at a 10 minute walk. T stops for Haymarket and Government Center are right there. South Station is a 15 to 20 minute walk.

Hey market station ( orange line)

15' walking, ~20' by the train

It is opposite the Hay Market Station. Pls take the orange line to the Oak Grove Station from down town crossing