I was only able to visit the new Go office last Saturday, and I'm impressed with the location. It's very near Robinson's Galleria mall, and therefore near MRT Ortigas station as well. And you don't even have to go through the building reception as it's on the first floor, and the entrance is facing the street.
Ground floor, Unit 122, Grand Emerald Tower,
Ruby Road, Ortigas Center
Here's the Google map link:
It's the corner building on Garnet Road and Ruby Road (cross Ruby Road if you're coming from MRT station or ADB Avenue).