Desiring a larger role for himself in the proprietary's administration, Martin sought to influence his uncle into reorganizing the management of the proprietary. At Martin's suggestion, Lord Fairfax relocated the proprietary's base of operations northwest from Belvoir to an expressly built land office depository and archive at Greenway Court in 1762. Prior to this move, a small land office had been in operation at Greenway Court. Following William Fairfax's death in 1757, his son George William Fairfax (1729–1787) had succeeded him as steward and land agent of the proprietary. Martin succeeded Fairfax as the steward and land agent of the proprietary in 1762. Fairfax's replacement by Martin, the transfer of the land office and Martin's increased influence over Lord Fairfax caused bitter feelings from George William Fairfax, as evidenced by his letters during this period. Fairfax and his wife Sally Cary Fairfax returned to England in 1773 prior to the American Revolutionary War and did not return afterward.