Mansfield realised that land was going up in value in Ireland in the early 1990s, and he successfully secured several thousand acres in and near Saggart, County Dublin, as well as other small pockets of land throughout Dublin. As property demand rose, so did the land value, and he successfully turned over his land assets. Mansfield's Citywest Hotel was built from scratch and established as the venue for the annual Fianna Fáil Ardfheis and for GAA functions. He carried on dealing in his machinery trade, which once again added to his wealth, amounting to a reputed €200 million, as of a 21 February 2010 report in the Irish edition of the "Sunday Times".