The newest skyscraper changing Boston’s skyline is finally complete after decades of planning and construction.

South Station Tower, a 51-story office and residential building constructed on top of the MBTA’s South Station, unveiled the project Wednesday night. Rising 690 feet above the city, the tower includes 166 condominiums on the top 16 floors, 680,000 square feet of office space, an 11th-floor rooftop “skypark” and an expansion of the South Station bus terminal.

“Every great city tells a unique story through its skyline. Today, Boston adds a powerful new chapter,” said Suffolk Construction CEO John Fish at an unveiling ceremony Thursday night. “This tower is so much more than just steel, glass and concrete. It’s a symbol of vision, innovation and determination.”

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