Take exits 465 south to exit 70 west. 31 turns into Meridian St once you enter Indianapolis. Just know that Illinois and Capitol are the next two streets to the west of meridian. Illinois is one way north and Capitol is one way south. There are many ways to go so don't panic if you miss a turn.
Garage is on SW side.
Illinois St Take a right and proceed three blocks past an underpass and garage is on left. Follow I69 directions. Or you can stay on 37 through the city to Fall Creek to Capitol south to garage at Pan Am Plaza. Follow 70 from West directions. Follow 70 from East directions.