Paul Allen's Former 21,000 Square Foot Mega Mansion In Atherton, CA

Enveloped by redwoods and a bevy of other mature trees in America's wealthiest zip code, is this Transitional-style mansion which was the home of the late Paul Allen, co-founder of Microsoft. Built in 2013 by Pacific Peninsula Group, the ultra private estate is situated on just under two acres of park-like land in Atherton, CA. Boasting a contemporary fashioned interior, it features approximately 21,030 square feet of living space with seven bedrooms (master suite has private sitting room), eight full and five half bathrooms, two-story foyer with three-story stair hall and L-shaped floating staircases, elevator, two-story great room with fireplace, formal dining room with fireplace, butler's pantry, chef-inspired gourmet kitchen with double islands, breakfast room with floor-to-ceiling windows, family room with vaulted ceiling, fireplace, a step-down bar, library with fireplace, a home theater, a spa with steam room and sauna, and a complete lower level that holds several casual living and lounging areas. Outdoor features include a gated entrance, 24-car motor court, detached three-car garage with house manager's suite, rooftop terraces, expansive covered and open patios, pergola, BBQ kitchen, water and fire features, swimming pool with spa, pool house, and a cabana with bathroom and changing rooms. This home is listed with Courtney Charney of Parc Agency Corporation.

8,000 Square Foot Mediterranean-Style Mansion In Malibu, CA

Known as "Villa Murphy", this Mediterranean-style mansion in Malibu, CA was built in 2002 and is situated on just under two acres of land that afford the custom built home panoramic Pacific and valley views. Designed with grand scale entertaining in mind, the interior spaces and heights give the illusion of the home being two times its actual size and multiple sliding pocket doors do well at blending outdoor and indoor living spaces. Villa Murphy features approximately 8,426 square feet of living space with five bedrooms, six bathrooms, two-story foyer with dome ceiling and spiral staircase, sunken two-story great room with barrel vault ceiling and fireplace, lounge with wet bar and fireplace, formal dining room that shares a two-sided fireplace with the gourmet kitchen which is complete with a number of stainless steel appliances and a waterfall island, a breakfast room, family room with fireplace, a three-car garage, and much more. Outdoor features include a gated entrance, motor court, courtyard with fountain, pergola, covered front porch, expansive rear terrace with BBQ kitchen and pizza oven, a spa with water feature that cascades down to the lower pad swimming pool, and a patio with fire pit. This home is listed with Emil Hartoonian of The Agency RE.

Newly Built 10,000 Square Foot Contemporary-Style Mansion In Malibu, CA

Perched high on 14 acres in one of California's prime coastal communities, this newly built contemporary-style mansion in Malibu, CA sits at the end of a 600-foot driveway affording it peerless Pacific and canyon views as well as boasting a bevy of sliding pocket doors that seamlessly merge indoor and outdoor spaces. It features approximately 10,000 square feet of living space with six bedrooms, five full and two half bathrooms, a two-story foyer with L-shaped open tread staircase that is accessed via a massive pivot door, an elevator, formal living room with fireplace, formal dining room, gourmet kitchen with stainless appliances and breakfast area, family room with fireplace, a study loft accessed via a catwalk, expansive lower level with second kitchen, home theater, wine cellar/tasting room, exercise room/yoga studio, massage room, a spa with steam shower and sauna, and a private guest suite. The home is complete with a three-car garage. Outdoor features include a gated entrance, motor court, rooftop terraces, decks, fire pit, zen garden with reflecting pool, and an infinity-edge swimming pool with spa. This home is being presented by Keyvan Kiarash of Rodeo Realty.

9,000 Square Foot Lakefront Stone and Shingle Mansion In Sunset, SC

This stone and shingle mansion in Sunset, SC was built in 2002 and is situated on 0.9 acres of land with 460 feet of Lake Keowee's shoreline. It features approximately 9,650 square feet of living space with five bedrooms, six full and three half bathrooms, foyer with U-shaped staircase, two-story great room with stone fireplace, formal dining room with fireplace, butler's pantry, gourmet kitchen with double islands, breakfast room, four-season porch, home office/library with vaulted ceiling, walkout lower level with recreation room, wet bar, eight-seat home theater, fully-equipped home gym, two-car garage, and more. Outdoor features include a motor court, balconies, deck, covered porch, patio, and boat dock. This home is listed with Luxury Lake Living Team.

9,000 Square Foot Traditional-Style Brick Mansion In Franklin, TN

This Traditional-style brick mansion in Franklin, TN was built in 2007 and is situated on just under an acre of land. It features approximately 9,601 square feet of living space with six bedrooms, seven full and three half bathrooms, two-story foyer with staircase, elevator, formal dining and living rooms, great room with fireplace, gourmet kitchen with breakfast bar, a breakfast room, L-shaped rear staircase, family room with vaulted ceiling and fireplace, expansive upper level seven-seat theater room wet bar, a four-car garage, and much more. Outdoor features include a motor court, covered porches, patio, swimming pool with water feature, and a cabana with BBQ kitchen.  This home is listed by Paula Hinegardner of The Paula Hinegardner Group.

10,000 Square Foot Contemporary-Style Mansion In Houston, TX

This contemporary-style mansion in Houston, TX was built in 2013 and situated on 3/4 acres of land. Designed by Lauren Rottet, the rustic gem is clad in limestone, wood, and stucco with a bevy of floor-to-ceiling steel framed windows that allow an abundance of natural light to flood the interior spaces. It features approximately 10,000 square feet of living space with five bedrooms, six full and three half bathrooms, two-story foyer with staircase, a living and dining room that share a stately two-sided stone fireplace, 750-bottle temperature-controlled wine case, gourmet kitchen with stainless steel appliances, breakfast room, family room with fireplace, wood paneled library, a second level home office, media room with wet bar, game room, home theater with bar area, three-car garage, and much more. Outdoor features include two gated entrances,  motor court, gated courtyard with olive trees and koi pond, terraces, balconies, patios, pool house, fireplace, BBQ station, and a limestone-edge swimming pool with separate spa. This home is listed by Delores "Dee Dee" Guggenheim of Compass RE Texas, LLC.

16,000 Square Foot European-Inspired Stone Mansion In Los Angeles, CA

Ten years young and brimming with traditional European flair, this stone mansion in posh Brentwood Park is situated on just over a half acre of land in Los Angeles, CA. It features approximately 16,152 square feet of living space with eight bedrooms, nine full and three half bathrooms, soaring two-story foyer with breathtaking L-shaped staircase, an elevator, formal living room with fireplace, banquet-sized formal dining room with fireplace, butler's pantry, expansive gourmet kitchen with double islands and a bevy of stainless steel appliances, breakfast room, wood paneled family room with fireplace and wet bar, a home office/library with fireplace located off of living room, a loft, and an upstairs play/media room. The lower level is complete with recreation room. There is also underground parking available for the modest car collector. Outdoor features include two gated entrances, Juliet balconies, covered porch, open and covered patios, upper and lower terraces, infinity-edge swimming pool with water feature and spa, and manicured rear grounds complete with stone path to a BBQ kitchen. This home is being presented by Keyvan Kiarash of Rodeo Realty.

18,000 Square Foot Colonial-Style Brick Mansion In Gaithersburg, MD

Located at the end of cul-de-sac in its own world, is this stately brick mansion that was built in 2004 and situated on just under 35 acres of land in Gaithersburg, MD. The golf course estate features approximately 18,422 square feet of living space with eight bedrooms, nine full and four half bathrooms, vestibule, two-story foyer with staircase and tray ceiling, two additional staircases, formal living and dining rooms, great room with fireplace and box ceiling, gourmet kitchen with stainless steel appliances, breakfast room, music room, grand sitting room with gas fireplace, home office/library, an expansive walkout lower level that includes a recreation room with fireplace, wet bar, wine cellar, exercise room, spa, home theater, and ballroom. There is garage parking for up to five cars and the detached three-car garage has a guest apartment located above. Outdoor features include a gated entrance, two motor courts, terrace, open and covered patios, free form swimming pool with separate spa, pavilion with BBQ kitchen, gazebo, nine-hole golf course, and a sport court. This home is being presented by Jazz Perry of Century 21.