Spectacular custom limestone manor house situated on prestigious Round Hill Club Rd. Set on a prime, level, 3 acre parcel in the heart of sought after mid-country Greenwich. Meticulously landscaped and gated property is an extremely private, park-like oasis. Extensive list of many upgrades available upon request - including tennis court, pool house, finished lower level plus much more. Pear tree lined driveway leads to a stately formal entry or though the archway to the rear court and garages. The main house features ~ 11,500 ft of finished space. Impressive marble entry foyer with views through to the rear lawn and leading to multiple formal and informal areas including a well equipped, light-filled kitchen and breakfast room which connect to the dramatic double height family room. Butlers pantry with custom wine cabinets leads to a spacious dining room perfect for large scale entertaining. Formal living room with elegant bar and custom paneled billiard room. Multiple home office/study and den options on this floor. Private first floor guest suite. Dramatic curved staircase leads to a well proportioned primary suite with generous custom closet space, serene bathroom and coffee/bar area. 3 additional guest suites on this floor along with a playroom that could be converted to an additional bedroom. Recently finished lower level offers endless entertainment including Dolby Atmos home theatre, game room, gym and a custom spa with sauna, steam room and massage tables. Pool with separate spa surrounded by expansive granite patios and served by a well-equipped outdoor kitchen and covered seating area with fireplace and TV. Stone and crystal fire pit for late nights under the stars. Elegant tennis court blending perfectly into the lawn. Guest house (~600 sf) features bedroom/2 bathrooms/kitchen and outdoor shower. Home interior was meticulously designed and curated by Gilles Clement Designs - this is the ultimate one of a kind estate in an exceptional location. Home is on a 7 bedroom septic.