Lambert Smith Hampton (LSH) will manage the commercial property of London Overground, Property Week has reported.
Its network includes stations on the North London, West London and Euston to Watford Junction lines and is due to receive more than £1.4 billion in investments.
"LSH will develop these sites into state-of-the-art facilities, so that both London Overground and its passengers receive all the retail benefits currently enjoyed on other mainline services," said Geoff Smith, director.
The infrastructure was previously managed by SilverLink Metro, who Mr Smith criticised for not taking advantage of the network’s retail opportunities.
He said LSH will "encourage potential tenants to sign-up during the early stages of the investment programme, with the incentive of the potential growth once it is complete".
London’s commercial property is served by a transport system comprised of bus, overground and underground networks.