Work has started on the controversial Paddington Cube, which will also include a new entrance to the Bakerloo line platforms under Paddington station.
As a project it has been subject to many delays, and the failed plans for a much taller tower, and still facing a court appeal in a few months time.
The 14-storey high building is expected to be completed in 2022 and replaces a former Post Office sorting office. As part of the development, passive provision is being included by the developer for a new entrance down to the Bakerloo line platforms.
London Underground has long wanted to increase their escalator provision to the platforms. But, they have struggled to find a possible location for a new escalator shaft within the confines of the existing ticket hall and the new building site could provide an opportunity for this shaft, by extending the ticket hall into the Paddington Cube site basement.
The new ticket hall area will be four times the size of the current cramped space, and will see the number of ticket barrier gates doubled to twelve.
The terms of the planning permission are for London Underground to look at developing its new entrance once the main block above ground has been completed.
Demolition of the current buildings on the site is due to start later this year, subject to the court of appeal hearing, which should be held in July.