Lewis, which is based in London's Millbank Tower, has acquired the lease to the renowned media centre, which housed Labour's PR operation until the party's recent move to 16 Old Queen St in London.
The agency is aiming to turn the centre into a public and private venue for conferences, events, press briefings and a 'drop-in' facility for journalists, including free access to phones and the internet.
Lewis head of public affairs Clive Booth confirmed that the Conservative Party has already expressed an interest in hiring out the centre for press briefings and media calls.
Booth said: "We want to leverage the centre's existing reputation and transform it into an international media centre."
The centre is purpose-built for the media, complete with facilities for press, broadcast and BBC-compatible equipment.
Lewis is planning to start hiring out the centre in the next couple of weeks with the journalist drop-in facility completed by the end of the year.
A Conservative spokesperson said: "We will consider the offer but we have made no decision yet."
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