WPI's brief covers the property developer's political and policy engagement across England and Wales, but not Scotland.
The agency was chosen because of its thought leadership approach to the account, as well as its ability to engage with policymakers.
WPI will report to British Land’s head of planning, Adrian Penfold.
In April, British Land put its public affairs account up for review. Its corporate comms director, Pip Wood, confirmed to PRWeek that WPI and Newington Communications had been invited to pitch for the business.
Qullier Consultants had been the incumbent agency since 2012 but it is unclear whether the agency re-pitched for the account.
British Land, a FTSE-100 company, was founded in 1856, has £19bn worth of assets under management and recorded revenues of £569m in 2016.
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