The Boston Herald is reporting that the Crosby Group, a business that manages billions of dollars for Fidelity Investments chairman Ned Johnson and his extended family, is planning on expanding its Salem operation by adding a three-story office building on Keewaydin Drive that would add about 200 employees.

According to the report, the plan would supersede the approved plan of the landowner to extend Keewaydin, which is located near Exit 2 of Interstate 93, and build a coprorate park that would create nearly 900 jobs.

Town Manager Keith Hickey told the Herald that the Crosby Group opportunity could pose "a stimulant for additional economic development" in Salem while Town Planner Ross Moldoff said "security will be paramount" and that's "why they don’t want the road to go through."

The Herald reported the plans were filed with the town Friday and the plans will face a Planning Board review.

The plans for the Keewaydin extension, which were approved by the Planning Board in 2011, are available here.