The word "pull" used in this context means: "to demolish; wreck" --Webster's Dictionary.
Of course the U.S government refutes Mr. "Silverstein's" disclosure, attributing the collapse of the 47 floor skyscraper to a "fire" which was ignited by "falling debris" from the other two explosively rigged Towers 1 & 2. They have to cover for Mr. Silverstein's "slip", because of the technical impossibility of implanting the necessary material and explosives to implode a large skyscraper in a few hours; so they assert he meant something else and concluded in their NIST report that WTC 7 was "the first skyscraper in modern times to collapse primarily as a result of a fire." Activating an extensive controlled demolition cannot be organized in a short period of time, but requires serious planning over a period of days: http://science.howstuffworks.com/building-implosion.htm
Since they were logistically unable to maneuver a remote-controlled jet into the side of WTC 7 they blamed its obliteration on a "fire".
In July 2001 the rest of the WTC was leased for $3.2 billion to Mr. Silverstein (who already owned WTC 7) by the Port Authority of New York and New Jersey to be paid over 99 years--included was a $3.5 billion insurance policy specifically covering acts of "terrorism". Two months later the buildings came down and Silverstein Properties ultimately collected around $4.5 billion from insurance agencies. Not bad for a days work. http://www.bloomberg.com/apps/news?pid=newsarchive&sid=aPunKOKxWwN0
Obviously 9/11 wasn't orchestrated by the CIA to solely make billions for their asset Mr. Silverstein (photo above). It was primarily initiated and organized as a means for the U.S. government to wage wars in foreign underdeveloped lands and reduce the civil rights of the American people as they incrementally transform America into a third-world police state like Cuba.