Ian Landy’s Great Falls home. Photograph by Craig Westerman. Virginia 1 Photograph by VS Aerials. Where: Great Falls. Sold by: Ian Landy, cofounder of the telecommunications company LightSpeed International. Listed: $17,995,000. Sold: $14,750,000. Days on market: 271. Style: Georgian. Bragging points: Eight bedrooms, 11 bathrooms, and five half bathrooms on more than 17 acres, with equestrian stables, a private lake, a sauna, an…