SECAUCUS, N.J. — Prism Capital Partners has begun a $4.5 million repositioning of One Harmon Plaza, a 10-story office building located in Secaucus. The 187,113-square-foot property is part of a mixed-use complex that also contains a Crowne Plaza Hotel and a shopping mall. Renovations to the center will include a new grand entrance plaza and canopy, major lobby and elevator upgrades, a new café and substantial parking garage renovations. Prism has also signed Jones Lang LaSalle to lease the more than 21,000 square feet of vacant space inside the building. Tom Reilly and Dino Mattessich of the firm’s New Jersey office and James Quinn of the firm’s New York office will handle leasing efforts.