What was the original teen titans team's HQ?

I know that for the new teen titans and such they use Titan Tower built by cyborgs father however cyborg wasn't in the original line up of robin( grayson), Aqualad, kid flash, and wonder girl. So if no cyborg I ume no titan tower built by cyborgs dad. If thats the case then where did they all meet up for team meet ups or a hide out or headquators or whatever you wanna call it.