Maybe we wanted you to sense him.
There is no actual front door to the Astrune mansion. You go up some steps to the first row of columns and realize that there are several rows going back, though there is a definite hallway going down the center. You move down this until you sense that you are surrounded. At least ten well-built men, clad in nothing but white toga-like skirts, emerge from behind columns and adopt threatening unarmed stances.