Do I understand this properly...you have raised the floor in one area, but leaving the floor as is in an adjoining area? And you are wondering how to deal with that difference in height?
If this is the case, you could build an oak "Hollywood saddle", which tapers from the height of the raised floor to the existing floor. If the height difference is 1", a piece of 5/4" oak should work.
Nice looking job.
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