SAN FRANCISCO, December 6, 2005 – ABM Industries Incorporated (NYSE:ABM) will announce its financial performance for the company’s fourth quarter that ended on October 31, 2005 on Wednesday, December 14, 2005 after the market closes.

Early the next day, on Thursday, December 15, 2005 at 6:00 a.m. (PST), ABM will host a live webcast of remarks by President and Chief Executive Officer Henrik C. Slipsager, and Executive Vice President and Chief Financial Officer George B. Sundby. Individuals interested in participating in the conference call are asked to register at 415/733-4061 by Thursday, December 8, 2005.

The webcast will be accessible at www.irconnect.com/primecast/05/q4/abm_4q2005.html. Listeners are asked to be online at least fifteen minutes early to register, as well as to download and install any complimentary audio software that might be required. Following the call, the webcast will be available at this URL for a period of one year.

In addition to the webcast, a limited number of toll-free telephone lines will also be available for listeners who are among the first to call 877/440-9648 within fifteen minutes before the event. Telephonic replays will be accessible during the period from two hours to seven days after the call by dialing 800/642-1687, and then entering ID # 3013802.

ABM Industries Incorporated is among the largest facility services contractors listed on the New York Stock Exchange. With fiscal 2004 revenues in excess of $2.4 billion and more than 73,000 employees, ABM provides janitorial, parking, security, engineering and lighting services for thousands of commercial, industrial, institutional and retail facilities in hundreds of cities across the United States and British Columbia, Canada. The ABM Family of Services includes ABM Janitorial; Ampco System Parking; ABM Security, which includes American Commercial Security (ACSS) and Security Services of America (SSA); ABM Facility Services; ABM Engineering; and Amtech Lighting Services.