TREVOSE, PA. — The grand opening has been held for the first building at Horizon Corporate Center in Trevose. Horizon II is a Class A office building located at 3800 Horizon Blvd. It is one of five buildings that will ultimately be built at the park, which will contain more than 1 million square feet of development. The building is also LEED-certified, as will be the rest of Horizon Corporate Center. Upon full build-out, it will be the largest LEED-certified corporate campus in the greater Philadelphia area. The project is being developed by King of Prussia, Pa.-based O’Neill Properties. The LEED architect is Cubellis.