http://www.transportbriefing.co.uk/story.php?id=4907
quote

Olympia to be remodelled in Overground property plan
Filed 24/04/08

Transport for London has appointed commercial property consultancy
Lambert Smith Hampton to manage property at stations across the London
Overground network.

The two-year contract makes LSH responsible for providing portfolio
management services across 50 stations on the North London, West
London, Gospel Oak to Barking and the Euston to Watford lines. TfL
intends to spend more than £1.4m over the next four years refurbishing
stations and increasing the number of on-site retailers to bankroll
further investment.

Plans include letting the large existing station building at
Kensington Olympia station to a retailer and constructing new
passenger facilities on a smaller site nearby.

Control of London Overground rail services, formerly branded
Silverlink Metro, was transferred by the government to the Mayor of
London, and hence TfL, in November last year.

Geoff Smith, a director in LSH’s transport team based in London, said:
“The former Silverlink Metro service did not take full advantage of
the retail opportunities available on its network. With the help of
TfL’s £1.4bn investment programme, LSH will develop these sites into
state-of-the-art facilities.

“Our aim is to 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.”

Last week managing director of TfL London Rail, Ian Brown, said: "All
London Overground stations will upgraded and refurbished by 2010 and
some will be remodelled depending on funding availability."
unquote

Is that it - letting the station building to a retailer and build a
couple of sheds – why not use the air rights over the station to build
a substantial high rise complex – office, retail, housing ala Dalston
Junction and use the profits to have decent station facilities. If
there was enough of a profit- TfL or Network Rail could reinvest to
electrify the GOBLIN Route thereby making the Overground all
electric.