The station is to have 24 platforms serving both high-speed and ordinary lines at a low level. The flats demolished for the extension would be replaced by significant building work above. The Underground station would be rebuilt and connected to Euston Square station. As part of the extension beyond Birmingham, the Mayor of London's office believed it will be necessary to build the proposed Crossrail 2 line via Euston to relieve 10,000 extra passengers forecast to arrive during an average day.