As I type this, the Jakarta MRT is scheduled to open next week. BNI City (fka Sudirman Baru) station on the Airport Rail Link appears to be quite close (~500m) to the upcoming MRT Dukuh Atas station, and this sounds pretty darn convenient for a planned business trip.
However, as previous visitors to Jakarta will know, walking 500m along the street can be quite the obstacle course, particularly if you have luggage. Are there any interchange facilities (tunnel, bridge, etc) for going from the Airport Rail Link to the MRT on foot?