Highlands Plaza One is a five-story, 146,000 square foot office building located South of Forest Park in the Highlands at Forest Park Campus. Situated on the former site of the Forest Park Highlands Amusement Park and the St. Louis Arena/Checkerdome, the Highlands at Forest Park, a 26 acre mixed-use campus, is one of the largest commercial/residential developments to be constructed in the City of St. Louis.