Construction crews hoisted the last steel beam atop the frame of the new cancer and surgical center at Beth Israel Deaconess Hospital-Needham on Chestnut Street last week, as local and hospital officials celebrated the milestone at a “topping-off” ceremony. The new three-floor, 30,000-square-foot center is to open next fall, and will consolidate the hospital’s cancer-treatment services on the first two floors. The $24 million building will also feature a new surgical pavilion that will allow doctors to perform advanced procedures, officials said in a statement. The new center is being built on the footprint of the hospital’s former administration building, and the project will also include a new parking lot, officials said. The project is the second phase of a plan to improve and expand Beth Israel’s services in area communities; in October 2009, the Needham complex opened a new emergency department and inpatient wing. Previously known as Glover Memorial Hospital, the facility joined Beth Israel Deaconess Medical Center in 2002.