Pasig or QC?

I just moved in to a new flat near Robinson's Galleria last month. And my new address reads Ortigas Center. I immediately assumed it's in Pasig City, but someone just told me it is still considered within the area of Quezon City.

I know, right? Are you kidding me? I know I'm a geographic idiot but this is the first time I have ever heard of this. They said the area is still covered by Santolan, QC or something like that. So I guess the $64,000 question here is:

San dapat magparehistro mga residents dito sa eleksyon? Huh. WEIRD.