After dealing with everything in Angel, Rio sent Esme away and moved on the highest floor of the building, which was his own private floor. Where no one but him was allowed entry.
As he stepped out of the lift, the doors and security measures locked the entire floor. His appearance started changing into that of Shiva and once done his figure disappeared into a spatial portal.
Appearing in his next office of Eclipse.
Eclipse didn't have a fixed headquarters, nor a fixed location from which they operated. The base Rio had gotten for Eclipse was actually a tower artifact, called 'Mahal of Madness'. (Mansion of Madness)