Cupples X, which was to be one of the first new office buildings downtown in 25 years, has been scrapped.

The Koman Group’s plans for the $43.5 million, five-story office building in the parking lot just south of the Westin St. Louis hotel are no longer moving forward, St. Louis Development Corporation Executive Director Otis Williams said Wednesday.

Koman had said in October it had an existing downtown business interested in filling much of the building’s 100,000 square feet, moving its 300 employees there and potentially adding 280 more.

The developer had requested $8.7 million in tax increment financing assistance from St. Louis, promising to reveal its potential tenant soon. But for months, the TIF Commission pushed back a public hearing on the project.

City officials at a TIF Commission meeting Wednesday finally said the project was no longer going forward. A Koman representative did not return a message.