This is the answer folks:
What prompted the planned move? Branch offices of Jehovah’s Witnesses in other parts of the world now share in the printing of Bibles and Bible-based literature, which was once exclusively done in Brooklyn. In 2004, printing and shipping operations in the United States were moved to Wallkill, New York, about 145 kilometers (90 mi) northwest of Brooklyn.
Cost too was a consideration. It is expensive to operate and maintain the facilities in Brooklyn. By relocating to a compact facility, the Witnesses can make better use of funds to support their work of Bible education.
Source: http://www.jw.org/en/jehovahs-witnesses/activities/construction/world-headquarters-relocating/