Part of the cost of building the £350m stadium in Ashburton Grove, north London, will be offset by turning Arsenal's old ground, Highbury, into apartments. AYH acted as a consultant for both elements of the project.
The Football Association last month confirmed that Wembley Stadium would not host May's FA Cup Final, as previously pledged. The Australian constructor Multiplex has reportedly lost over £100m on the project.
AYH has also hired property PR agency Redwood Consulting to handle its corporate comms.