Season 1 - 0 time

Season 2 - 2 times

 219: Last Night
Operations: It's not an ultimatum, it's an invitation, my last. I've reserved the Tower for 8 o'clock. I hope you'll join me.

Scene taking place in the Tower:
Madeline is walking down a long narrow corridor. There are floor lights lining both walls. At the end of the corridor, there is a Chinese looking statue. Her palm and eyes are scanned by a computer, the door opens. Operations is pouring champagne into two glasses. The room looks like someone's living room, there are two sofas facing each other. There are pink roses placed around the room. A jazz song is playing in the background.

Michael: It was a simple statement of fact. Perhaps we shouldn't have gone to the Tower.

Season 3 - 2 times

 314: Hand To Hand
Operations: In the tower, tonight, ten o'clock.

 320: Three Eyed Turtle
Operations: I’d like to see you in the Tower.

A scene takes place in the Tower. Madeline is getting dressed; she has a bruise on her neck. She and Operations have a fight, but later we find out it's all been a setup for George.


Season 4 - 1 times

409: Down A Crooked Path
Flashback to Operations and Madeline in the Tower from Last Night while his memory is being copied by George's team.

 414: Line In The Sand
Secretary: He’s in the Tower.

A scene takes place in the Tower, we see Operations with a woman. Birkoff burst in for an emergency.


Season 5 - 7 times

502: A Girl Who Wasn’t There
Operations: And our nights in the Tower?.

 504: All The World's A Stage
Quinn: Can't I be attracted to you without having an ulterior motive?
Operations: You could. But you're not. Yes, Madeline and I spent time occasionally in the Tower, but that had nothing to do with the way we felt about each other.

Operations: Madeline wasn't who she was because she slept with me. You're not ready for the Tower yet.

Operations: Why don't you bring it up to the Tower later?

A scene is filmed in the Tower after Operations and Quinn have had sex. She's trying to be friendly but he's very cold.

 The Man Behind The Curtain
Mr. Jones: The object is to destroy it. Now the team will approach from the South and they will egress the same way.

O'Brien: I don’t get it. Black Moon has no connection with the Collective, and the egress route...

 The Evil That Men Do
Quinn: I thought he was in the Tower.
Operations: The diagnostic when I was on the plane took 40 seconds. Last night I called it up a hundred times. It never took more than 10 seconds. It got me to thinking, so I had the Tower swept. Found this.

Operations: Here’s the bug she put in the Tower.