Lost Mine of Phandelver
More of a castle than a manor, it was an ancient building that was abandoned after the orc raids in 951 DR. The cellars have been turned into the hideout of the Redbrands. The cellars were once served as a safe haven when the estate was attacked. It also served as a resting place for the deceased member of the Tresendar Family.
With some work, this place could become a base of operations for the party but it was in much disrepair. The family was buried in the tunnels/basement below the manor and have been laid to peaceful rest now that the Redbrands have been cleared out.