The redevelopment of Union Station has the potential to be one of the biggest East Coast TODs in the next 20 years. To give you an idea of how involved this process is going to be, the first air rights building isn't expected to be completed until 2023. Planners have to find a way to redevelop the station without interfering with its 113,000 daily weekday riders, especially as that number doubles by 2033, the New York Times reports. The historic original building will also be preserved. Here's a quick glance at everything you need to know about the grand development plan:

Title: Burnham Place/Union Station's 2nd Century
Reason for title: Named after architect Daniel Burnham, who designed the station.
Cost: $8.5B
Size: 14 acres
Master planners: Shalom Baranes Architects for Burnham Place. Beyer Blinder Belle and Grimshaw Architects for the Union Station portion.
Air rights: Akridge acquired air rights in 2002 for $10M, and has committed to funding an additional $1.5B.
Plans beneath the tracks include: A lower level platform for more trains, demolishing a 2,200-space garage to replace with a larger one, plus more bus parking.
Plans over the tracks include: 3M SF of development, with 1,300 residential units, 100k SF retail, 500-plus hotel rooms, parks and plazas. [NYT]