EMB170:
Looking at the jepp chart, i would descent to 1700' if i'll do the procedure and, step descent to 2200' if i'll approach from TBG.
Looking at the chart it looks to me that the island where the TBG stands on is 1007' high and that is the reason for the step descent.
Well, no segment of that IAP has a steep descent.
Here is another base leg course reversal over the same airspace. Seems like it should be 1,700 too, based on your assessment.
