The biggest building in the state is going to be even bigger than previously expected.

Billionaire mortgage mogul and real estate maven Dan Gilbert's skyscraper slated for downtown Detroit may grow by more than 100 feet to 912 feet tall, Crain's has learned.

While the final height has not yet been determined, Joe Guziewicz, vice president of construction for Gilbert's Bedrock LLC, confirmed that it will be taller than the 800 feet that was previously announced as the company looks to get "the most flexibility for how we use it and how we program it."

"We may end up at 900," Guziewicz said, adding that the city has been briefed on the plan. "This has been an ongoing struggle for us for the last eight months. We get one shot and we want to be sure we have the right components inside."

Those include residential, and possibly hotel and other uses, although a final configuration of the space hasn't been decided. The previously revealed $909 million cost is almost certain to grow, although by how much is not known.

The maximum height of 912 feet was arrived at because that's the height the elevator cores as they are currently designed can support, Guziewicz said.

It's the third time the publicly revealed height of the J.L. Hudson's department store site tower has changed since it was originally revealed in February 2017, when it was 734 feet tall, just 7 feet taller than the 727-foot Detroit Marriott at the Renaissance Center with a cost of $775 million. Then in September 2017, another 66 feet and a sky deck were added to the building, bringing it to 800 feet in height and a $909 million price tag.

Adding another 112 feet would make it one of the tallest buildings in the United States, according to the Council on Tall Buildings and Urban Habitat, which monitors skyscraper construction around the world.

The council lists 80 buildings in the U.S. that are completed, under construction or proposed that are at least 912 feet. If all of them are finished, the tower at its maximum height would be the same size as 125 Greenwich Street in New York City (912 feet) and a shade taller than Oceanwide Center Tower 1 in San Francisco (910 feet), which are the 80th and 81st tallest buildings proposed, under construction or built in the country, respectively. The 15 Hudson Yards tower in New York is 914 feet, and 79th on the list.

The tallest completed building in the U.S. is One World Trade Center in New York City, which is 1,776 feet, while the tallest building in the world is Burj Khalifa, which stands 2,722 feet in Dubai.