The 2002 Pulitzer prize winner for Breaking News Reporting, The Wall Street Journal's "Trade Center Firms Fear For Friends and Colleagues," printed on page B1 of the September 12, 2001 edition, has "Alliance consulting" located on the 18th floor of the South Tower. The WSJ DOES NOT attribute their source as being the CoStar Group.
The CNN: List of World Trade Center Tenants, which archive.org dates its first sighting of this page on the web as on Sept. 13, 2001, lists an Alliance Consulting on 18th floor of the SOUTH Tower. [Tenant List provided by CoStar Group, Inc.]
USA Today's "World Trade Center — south tower tenants," which says it was "updated 09/13/2001 at 08:51 AM ET," lists an Alliance Consulting on 18th floor of the SOUTH Tower. [Source: CoStar Group]
However, Forbes Magazine's World Trade Complex Tenants, timestamped September 14, 2001, at 6:49 PM ET, lists an Alliance Consulting as being on the 102nd floor of "1 WTC," which is the NORTH Tower. And their stated source is CoStar Group
But then again, Crain's New York Business: South Tower (2 World Trade Center,) which archive.org dates a first appearance of on Sept. 22, 2001, lists Alliance Consulting being on the 24th floor of the SOUTH Tower, with the same standard and exclusive attribution made as previously: Source: CoStar Group Inc., a real estate information services company. The complementary page, Crain's New York Business: North Tower, doesn't say a word about an Alliance Consulting being in the tower, so this isn't a case of an erroneous, but redundant citation being made.
Also available online is an undatable .pdf document, which comes up frequently in searches, and which defies my efforts at understanding the how, and by whose mechanism it came into permanent electronic existence. Called "Tenant List provided by CoStar Group, Inc.," Building: 2 World Trade Center South Tower, it lists Alliance Consulting as being on the102nd floor of the SOUTH Tower.
After the heading, but before the columned table laying out the facts, comes what at first glance seems like the standard disclaimer crafted by lawyers to make a generic statement absolving anyone of attendant responsibilities, of a type typically not found in such a prominently placed positioning:
Although CoStar makes efforts to ensure the accuracy and reliability of its information, CoStar makes no representation or warranty regarding the quality, accuracy, timeliness or completeness of such information. CoStar cannot guarantee that its tenant specific data is 100 percent accurate or complete, and errors and omissions do occur. Accordingly, CoStar is not responsible if its information is not accurate, complete or current, and CoStar has no responsibility for any consequence relating directly or indirectly to any action or inaction that you (or a third party) take based upon the tenant specific data presented below.
All of these mainstream news sources source their tenant information to CoStar Group, Inc., which was founded in 1987 with headquarters in Bethesda, Md. CoStar describes itself as a provider of information and analytic services to the commercial real estate industry
A list maintained on a website called WorldTrade Aftermath, titled, "2 WTC (South Tower) Tenants by Floor," [archive.org dates the page's first appearance t Oct. 4, 2001] also lists Alliance Consulting as on 102nd floor of the SOUTH Tower, and providing a link for further information to www.alliance-consulting.com, which takes you to the website of Alliance Global Services.
WorldTradeAftermath does not claim the source of its information as being CoStar, but rather the following:
CNN - Television and Website (cnn.com)Since it also doesn't claim Forbes to be a source, nor how it narrowed down the publicly available choice between four separate floors as possibly being sites for the office, perhaps direct company contact informed them.
The Wall Street Journal - Website (wsj.com)
The New York Times - Website (nytimes.com)
Company Websites - Each is listed with company contact information
3rd party emails - Usually listed as "unconfirmed" within the listings
Direct Company Contact - Where I have emailed or called the company directly
In another list of World Trade Center tenants---sui genesis, but with the optimistic title---World Trade Center Tenant List Revised January 27, 2003, lists Alliance Consulting as on the 102nd floor, in Suite 10255, in the NORTH Tower, and provides a contact name and number, Amy, at 800-706-3339. This would have Alliance sharing the floor with the Nishi Nippon Bank, [Misato Higuma 81-92-476-2481 Japan 800-706-3339] and with Cantor Fitzgerald, who this list says has half the floor.
A recent thread at Let's Roll Forum announced a LETS ROLL PRESS RELEASE: World Trade Center Occupancy FOIA * 1972-2001, about a researcher there who had successfully petitioned the Port Authority with a Freedom of Information Act request, to provide him with the following:
1. A complete listing of all occupants of the world trade center, from the time they were finished to the time they went private, in 2001.
2. Listing of occupants by floor and by space.
3. Listing of occupants leases, with the start and end dates of those leases.
It is too early to determine if the list provided him is as comprehensive as he requested, but if it turns out to have been provided to him by the Port Authority, it would represent the first official sanctioned source of tenant information in the towers available. The lists' relevant section in tower 1 is below, with corporate name, building, floor number, suite number, and lease start and stop dates:
CANTOR FITZGERALD SECURITIES 1WTC 101 10101B 9/1/1997 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 101 10101 1/1/1997 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 101 10101A 1/1/1997 3/16/2012
LOWER MANHATTAN CULTURAL COUNC 1WTC 102 10265 8/12/1998 12/31/1999
CANTOR FITZGERALD SECURITIES 1WTC 102 10207 9/1/2000 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 102 10245 4/1/2000 4/30/2001
NISHI-NIPPON BANK 1WTC 102 10227 11/1/2000 10/31/2003
NISHI-NIPPON BANK 1WTC 102 10227 11/1/1990 10/31/2000
ALLIANCE CONSULTING GROUP, INC 1WTC 102 10265 1/1/2000 12/31/2009
ALLIANCE CONSULTING GROUP, INC 1WTC 102 10263 10/1/1999 9/30/2009
ALLIANCE CONSULTING GROUP, INC 1WTC 102 10245 10/1/1999 12/31/2005
ALLIANCE CONSULTING GROUP, INC 1WTC 102 10245A 7/6/2005 10/31/2008
ALLIANCE CONSULTING GROUP, INC 1WTC 102 10251 11/1/1998 10/31/2008
CANTOR FITZGERALD SECURITIES 1WTC 103 10301 5/1/1997 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 103 10301A 5/15/1995 3/16/2012
WNBC-TV 1WTC 104 10401 5/1/1994 4/30/1999
CANTOR FITZGERALD SECURITIES 1WTC 104 10451 8/10/1979 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 104 10403 6/1/1979 3/16/2012
CANTOR FITZGERALD SECURITIES 1WTC 105 10501 8/10/1979 3/16/2012
No other mention is made on this list of Alliance being on floors 18, 24 or 102 of the South Tower, or anywhere else in the complex.
The Dun & Bradstreet's "World Trade Center Business Listing - www.dnb.com, as of September 11, 2001," [Quick View] lists an Alliance Consulting Group Associates Inc. with the D & B # 938339652
The Wall Street Journal reported that seven out of 22 Alliance employees at the WTC are confirmed dead, and their temporary office being at 390 Park Ave.
A year afterward, the news site boston.com was still reporting that Alliance Consulting had offices on the 18th floor of the South Tower.
Wikipedia's List of tenants in Two World Trade Center and List of tenants in One World Trade Center both mention Alliance Consulting.