PNC Center, formerly National City Center and often still known by its original name, the Top of Troy, is a high-rise office building in Troy, Michigan. The complex consists of a 25-story triangular office tower and a two-floor atrium containing offices, retail, and a conference center. Completed in 1975, the International-style tower is the tallest building in Troy and among the tallest in Oakland County, standing 346 feet tall with 667,000 square feet of office space. PNC Financial Services maintains regional offices in the building as the major tenant.