Separate contributions have been levered out of BAA Pic (£230 million) and the City of London (£250 million), and from Canary Wharf and Berkeley Homes (£300 million). The projected tax receipts are of a broadly similar scale to some of the estimates of the productivity and agglomeration benefits expected from the project (Worsley, 2011). The supplementary tax on commercial property covers a quarter of the investment cost and reaching this agreement with the local business community ended three decades of delay in finding finance for the project.