The Los Angeles Metropolitan Transportation Authority (Metro) has released a new promotional video showcasing preliminary designs for a collection of dramatic upgrades slated for the city’s Union Station railway and transit terminal in Downtown Los Angeles.

The fly-through video features conceptual designs for the improvements and demonstrates that designers for the project are thinking big as they aim to rework the historic Los Angeles Union Station building.

According to the video, a new circular, airport terminal–like elevated concourse will wrap between train platforms on the far eastern end of the complex, with the station’s many public transit connections scattered throughout the station’s western extents. The scheme calls for sandwiching an ADA-accessible vertical circulation core between the new structure and the existing station functions. The above-grade concourse will also feature retail spaces, wayfinding signage, and treetop views of the city, all looping around multiple train concourse platforms that will eventually include a depot for California’s forthcoming high-speed rail network.

The new concourse is part of the ongoing LINK Union Station project that aims to add through service to the regional transit hub. Currently, several regional transit lines dead end at the station, an arrangement that will change once the improvements are made, allowing for faster travel times through the area, a reduction in necessary transfers between regional commuter rail lines, and expanded access and visibility for the hub.

Metro has not secured funding for the project, which according to certain estimates, could cost between $1.7 and $2.1 billion. The scheme will be in the running against a more expensive ground floor concourse concept that is still currently under development. For more information, see the Metro website.