Few and far between are the properties that offer a private lane through a woodland forest and stone columns, then a first glimpse of a slate-roofed, many chimneyed mansion surrounded by towering oaks. Beyond the house and its circular drive, there are gardens both intimate and grand, from the pollination enclave to an herb garden. A boxwood retreat and a fern-cloaked stone marker are visible from the parlor. And just beyond the columned portico beckon the manor’s formal walled gardens, each set off from the other like rooms in a lovely home, all sheltered by breathtaking specimen cedars and redbuds.