Building 7 was mostly a government building http://www.wtc7.net/background.html
What Was In Building 7?
Building 7 was one of New York City's larger buildings. A sleek bronze-colored skyscraper with a trapezoidal footprint, it occupied an entire city block and rose over 600 feet above street level.
Built in 1985, it was formerly the headquarters of the junk-bond firm Drexel Burnham Lambert, which contributed to the Savings and Loans collapse, prompting the $500-billion taxpayer-underwritten bailout of the latter 1980s. At the time of its destruction, it exclusively housed government agencies and financial institutions. It contained offices of the IRS, Secret Service, and SEC.
Tenant Square Feet Floor Industry
Salomon Smith Barney 1,202,900 GRND,1-6,13,18-46 Financial Institution
IRS Regional Council 90,430 24, 25 Government
U.S. Secret Service 85,343 9,10 Government
C.I.A. N/A N/A Government
American Express Bank International 106,117 7,8,13 Financial Institution
Standard Chartered Bank 111,398 10,13,26,27 Financial Institution
Provident Financial Management 9,000 7,13 Financial Institution
ITT Hartford Insurance Group 122,590 19-21 [Insurance]
First State Management Group, Inc 4,000 21 Insurance
Federal Home Loan Bank 47,490 22 Financial Institution
NAIC Securities 22,500 19 Insurance
Securities & Exchange Commission 106,117 11,12,13 Government
Mayor's Office of Emergency Mgmt 45,815 23 Government
One of the most interesting tenants was then-Mayor Giuliani's Office of Emergency Management, and its emergency command center on the 23rd floor. This floor received 15 million dollars worth of renovations, including independent and secure air and water supplies, and bullet and bomb resistant windows designed to withstand 200 MPH winds. 2 The 1993 bombing must have been part of the rationale for the command center, which overlooked the Twin Towers, a prime terrorist target.
How curious that on the day of the attack, Guiliani and his entourage set up shop in a different headquarters, abandoning the special bunker designed precisely for such an event. 3