The Olympic Park Planning Committee last night approved plans for the International Broadcast Centre and the Main Press Centre.
The buildings will support 20,000 journalists and photographers during the Games and provide almost 900,000 sq ft of office space in legacy.
Piling is now 90 per cent complete, with more than 2,200 concrete piles sunk 24 m into the ground.
In the coming weeks, work will start on the 275m long, 104m wide, 21m tall steel frame of the IBC studio building, which is big enough to house five jumbo jets.
More than 4,500 tonnes of steel with up to 24 m long plate girders are being produced and fabricated for the IBC in Dalton, North Yorkshire.
Design refinements include new cladding detail for the MPC office block, new chequerboard cladding for the 60,000 sq m IBC studios and smaller sections of screening over the gantry.
Olympic Delivery Authority chief executive David Higgins said: “The big build of the IBC/MPC is right on track.
“The IBC/MPC will provide a quality working environment for media during the Games, while delivering flexible employment space for a range of potential legacy tenants and users.”