I assume that you mean Berjaya Hotel, was Best Western in the past. Am I correct. If so, at 5am, its a bit early, but the red light district is very near and with it are many money exchangers, some 24 hours. Up Burgos street on the left, is a good one, but walk around and compare rates. There is a good changer, next to the small pharmacy on the corner of Makait ave and Burgos st.(Makati Ave side)before Andoks that has good rates.
If you will be in Makait for the whole day, there are many other exchanges in Greenbelt One etc. and the more well known one there is Sanrys. Depending on how much you will cash, makes it worthwhile to shop around. But the rates in the Burgos area are good and competitive. This is a 3 minute walk from your hotel