sentences:  Architectural historian L. Morris Leisenring had studied the Belmont–Paul House for the Architect of the Capitol, and concluded that the two adjacent structures had once been slave quarters and a tobacco barn, and warranted preservation.Leisenring had recently overseen the restoration of Arlington House, The Robert E. Lee Memorial, and his opinion persuaded many House members that the entire NWP complex should be saved.But other historians disputed Leisenring's conclusions.