Tenacre, a timeless example of the 20th century Hamptons shingle-style home, with historic provenance, is situated in Southampton's estate section on three splendid acres. Commissioned originally in 1920, architect John Russell Pope adopted the key elements of the shingle-style that combines a feeling of informality and refined livability. Those elements have been maintained even as the nine-bedroom, 15,200+/- square foot home has been upgraded and expanded over the decades. This unique offering is enhanced by tall hedges and mature trees across the developed landscape. The gated entrance opens to a winding drive to the main entrance and delivery entrances. Myriad indoor-outdoor areas offer uninterrupted flow, creating "fresh air" living and entertaining spaces complemented by flower beds and shade trees. Designer decorated, the home's covered entry opens to a foyer that connects to all the entertaining spaces. The level of built-in details and one-of-a-kind finishes is exacting everywhere, from the living room to the sun room, formal dining room, and paneled library, each with its own fireplace. Floor-to-ceiling French doors open to various patios. A swinging door from the dining room opens to the "heart of the home:" the kitchen ensemble with morning room, bar, pantry, marble counters, center island, and professional stainless steel appliances. One side of the kitchen opens to a casual dining area and family room. The other side opens to casual outdoor seating and dining patio, that is complemented by a formal seating and dining patio at the front of the home. The service area comprises a laundry, half-bath, mud room, and access to the garage with lifts that accommodates six vehicles. Above the garage two bedroom suites have their own built-in bar. The main stair rises to its landing and long gallery accessing the principal bedrooms. The master suite offers a sitting room with fireplace, dressing rooms, two separate baths, walk-in closets, and a wood-paneled peaked ceiling. An over-sized guest suite with fireplace and three more unique guest suites occupy the second floor. The pre-existing third floor offers two bedrooms and a bath. The lower level includes a wine room, a media room, second full laundry, staff areas with bathroom, storage, and walk-out. The home also includes a laundry chute, and radiant heat in six of the ten bathrooms. The separate, indoor pool house offers a unique four-season pool with lap lanes, infinity swim, and slide, as well a full bath and sauna with viewing window to the pool, plus a spa on the adjoining deck. A detached garage accommodates three more vehicles and separate bike room. The property includes a power generator and has a permit for tennis.