I could smash the door open, since it's glass.
Guess there's no time like the present, you think to yourself, then you make a fist and punch the glass. Even with your gauntleted hands, it still takes a few blows to crack the glass open; you're guessing that it's bullet- and shatter-proof in case of situations like these. Still, each punch creates a crack in the window until you manage to smash through the glass with a loud crash. You wince a little when the glass hits the ground and hope that no one reacts to the sound.
You move into the lobby quickly and dart towards cover behind the reception counter. Fortunately, no one seems to have registered your attempts to break into the tower, and you let out a sigh of relief. After waiting another moment or two, you take a quick look around the lobby.
To your left, you can see what appears to be a door labeled 'Security'. The only problem with that option is that the door looks too small to let you into the room. You might have to ignore it since you can't get in. Besides that, there's also a staircase that goes up to the third floor and two elevators nearby that you could take. You look around for a while, trying to think about what to do, then you decide to…