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I don't know whether data extraction [which I have no experience with] can do a combined extraction of Attributes and insertion-point coordinates, but even if it could, I see potential problems. The coordinates wouldn't likely be of much use by themselves, and I'm not sure there would be any way to tie them to a surrounding Polyline. And if you have multiple floors, you would likely have areas that cover the same coordinates extent on more than one floor, so just the coordinates wouldn't tie a Block down as to where it is.
Probably the better way would be to add an Attribute to the Block definition for a room number. That could then be extracted along with the other Attribute information, and would also cover which floor a Block is on, even if its insertion point is the same as one on another floor.