Planners for a Hilton hotel at the Columbus, Ohio convention centre are adding another floor, a rooftop terrace, and about $20 million in proposed construction costs, the Columbus Dispatch reports.

The expanded hotel would have 27 floors, 468 rooms, and additional meeting space. It will be built across the street from an existing, 532-room Hilton convention centre hotel tower in downtown Columbus, near Ohio State University.

“Our goal is to meet the industry standard for convention hotels, which is no less than 75 square feet of meeting space per guest room, so for a 1,000-guest convention hotel, that means we should have no less than 75,000 square feet of meeting space for the two towers combined,” said Don Brown, executive director of the Franklin County Convention Facilities Authority.

The new hotel is still in the planning stages: a proposal will be presented to the Columbus Downtown Commission in January. With governmental approval, construction would begin in August 2018, with a projected opening date of early 2022.

The Greater Columbus Convention Center also is connected via skywalk to a Crowne Plaza hotel, with a Hyatt Regency hotel and Drury Inn also nearby.