This is what it says at the link. Of course, I suppose, any viewing party could have just moved up to the 24th floor...
"On September 11, 2001, Barry Jennings, Deputy Director of the Emergency Services Department of the New York City Housing Authority and Michael Hess, New York City’s corporation counsel, headed to the Office of Emergency Management’s Emergency Operating Center (FEMA), which was on the 23rd floor of WTC 7. Hess was expected to meet with New York Mayor Rudy Giuliani at the office.Hess is an elite Yale and Harvard graduate, a lawyer who has represented the United States in numerous major cases. Michael Hess-any relationship to the House of Rudolph Hess? I can’t say.
Jennings recalled finding a large number of police officers in the lobby of WTC 7 when they arrived before the collapse of the New York World Trade Center Towers. The two men went up to the 23rd floor, but could not get in, so they went back to the lobby. The police and security took them back up in a freight elevator. When they arrived on level 23, they found the 23rd floor had been recently deserted and absolutely abandoned, “coffee that was on the desk, smoke was still coming off the coffee, I saw half eaten sandwiches”.
At that point, Jennings made some phone calls, and an un-named individual told them to “leave, and leave right away”. Jennings and Hess then proceeded to the stairs, and made it down to level 6, when there was an explosion, and the stairwell suddenly blew out and collapsed from under their feet. Jennings was left hanging for his life from the stairwell, but was able to climb back up to safety.
They made it back up to level 8 where Jennings had a clear view of the twin towers, both buildings were still standing. Jennings and Hess were trapped on level 8 north side of the building away from south side facing the twin towers. On the 8th level, they began to break out windows for fresh air. From outside, firefighters advised Jennings not to attempt to climb down to safety on a suspended fire hose. It wouldn’t hold him.
Subsequently and after the collapse of the World Trade Center Twin Towers, Jennings and Hess was rescued by firefighters that led them back down into the lobby. When they made it to the lobby, Mr. Jennings found it destroyed and littered with dead bodies. He said it looked like, “King Kong had came through it and stepped on it, (it was) so destroyed, I didn’t know where I was. So destroyed that they had to take me out through a hole in the wall, that I believe the fire department made to get me out.”
Jennings boldly refuted and did not stand down and accept the official reason that the noises he heard were from a fuel oil tank, “I know what I heard, I heard explosions”. The explosions that Jennings experienced in World Trade Center Building 7 was most notably before the collapses of the twin towers."