UPS in the 81st floor of WTC2: NIST answers.

I received an answer from NIST about UPS in the 81st floor of WTC2.

I wrote in my blog an article about lead batteries in the South Tower.
This is the link to my article:

Now I receive this email from Mr. Michael Newman Spokesman, NIST WTC Investigation:

"Date : 17/03/2008 19:23
Sender : Michael E. Newman

Re: Question about UPS in WTC2

Modifications were made in 1991 to reinforce the 81st floor of WTC 2 in an area occupied by the United Parcel Service.

Modifications were made in 1999 to floor 81 in an area of the floor occupied by Fuji Bank to accommodate the weight of an uninterruptible power supply.

Both of these modifications are documented in the section of the NIST WTC Investigation Report known as NCSTAR 1-1C (go to ).

What is perhaps confusing is that both modifications were made to areas where there are two-way trusses (the corners of the building) and the acronyms (UPS for "United Parcel Service" and "uninterruptible power supply") are the same.

However, these modifications were made eight years apart for two different tenants, so there is no link between them.

I hope this answers your question.

Thank you,

Michael Newman Spokesman, NIST WTC Investigation

Michael E. Newman

Senior Communications Officer
Public Affairs Office - National Institute of Standards and Technology
100 Bureau Drive, Stop 1070

Gaithersburg, MD 20899-1070
NIST info at
NIST news and Tech Beat newsletter at
WTC investigation info at http://wtc/


In my opinion, this is the first time NIST clearly speaks of an UPS ("uninterruptible power supply") area in the 81st floor of WTC2.

best wishes from Italy,
Happy Easter,

Enrico (Henry62)


I would assume that United Parcel Service had moved out of the 81st Floor by 2001, since I've never seen them listed has a tenant?

It's also interesting that the work was done in the corners of the floor 'where there are two-way trusses'. I'd like to know which corners were worked on? The corners of a building are important , because these are strong points that you would want to break first in a CD. If I was a gambler, I'd be willing to bet that the 2nd modification for Fuji Bank was done in the NE corner, which was one of the first places to fail when the collapses began.

The 81st floor was also important even before the above mentioned modifications, since this floor originally had additional reinforcements built in to carry the weight of the elevator hoists. This made it an important floor to target for the initiation of a CD and is probably why someone wanted to add even more weight to a floor that already had a substantial load. Besides those UPS batteries might not have all been batteries and could have had anything inside of them, including explosives.