Beverly Hills designer Joelle Uzyel breaks down Antilia, Mukesh Ambani's 27-floor, 400,000-square-foot residence on Altamount Road in Mumbai, built for an estimated $1 billion to $2 billion and designed by Perkins & Will with interiors by Hirsch Bedner Associates. A floor-by-floor analysis of the cantilevered structure, the terrace gardens, the snow room and wellness floors, the 168-car garage, the full room list from the ballroom and 50-seat theater to the temple, the Z+ commando security detail, and what the house teaches about building at the very top of the market.
Antilia is 27 floors and 400,000 square feet on a 1.12-acre lot. With double-height ceilings throughout, it stands as tall as a 60-story tower.
Building up was the only way to fit this program on a South Mumbai lot. The stacked, cantilevered form is a land decision before it is a style decision.
No two floors share the same plan or materials. That makes every level memorable and the house as a whole harder to read as one home.
The snow room, spa, and pool show how early the wellness program became the center of the brief at this level.
A large share of the building is garage, service, and mechanical floors. A staff of about 600 keeps it running. At this scale, the operations plan is the design.
Security is built in, not added on. The family has Z+ cover, India's highest category, with a team of armed commandos working in shifts.
This is not a house. It is a vertical palace. Antilia rises 27 floors above Altamount Road in South Mumbai, and every one of them belongs to a single family. Mukesh Ambani, one of the wealthiest people in the world, built it for an estimated $1 billion to $2 billion. In 2023 it was valued at roughly $4.6 billion. Those numbers get the headlines. The design decisions underneath them are more interesting.
Three helipads. A garage for 168 cars. A 50-seat theater, a ballroom, a temple, terrace gardens, a spa, and a room that makes snow in a city that almost never sees cold. Roughly 600 staff. A detail of armed commandos at the gate. A structure engineered to stand through a magnitude-8 earthquake. I study homes like this one not because of who lives in them, but because they show what happens when a residential brief has no ceiling at all. Some of what Antilia does is brilliant. Some of it is a warning. Both are useful to anyone building at the top of the market in Beverly Hills, Miami, or New York.
Antilia stands 173 meters, or 568 feet, on a plot of 1.12 acres. The floor area is over 400,000 square feet. For scale, a very large estate in Bel Air runs 20,000 to 40,000 square feet. Antilia is ten to twenty of those stacked on a lot about the size of one. At $2 billion, the build works out to roughly $5,000 per square foot, a number that only makes sense once you see how much of the building is structure, systems, and service rather than rooms.
The team was international. Perkins & Will in Chicago designed the architecture. Hirsch Bedner Associates in Los Angeles, a firm best known for hotel interiors, designed the inside; Nita Ambani reportedly chose them after seeing their work at the Mandarin Oriental in New York. Construction began under Leighton Asia and was completed in 2010 by B. E. Billimoria & Company. The family moved in during 2011.
Hiring a hotel interiors firm tells you how the family saw this building from the start. Not as a house. As a property to be operated.
In Los Angeles or Miami, a family with this budget buys several adjoining lots and builds a compound. South Mumbai does not offer that option. Land on Altamount Road is among the most expensive in Asia, and parcels this size almost never come up. The only way to fit the program Ambani wanted onto 1.12 acres was to go vertical.
Going up changes the whole design problem. Many floors have double or extra-high ceilings, so 27 floors reach the height of a 60-story building. The structure is a central core with volumes cantilevered off it at different depths, which is why the silhouette looks stacked rather than smooth.
Each cantilever creates an outdoor terrace on the floor below. That is the smartest move in the building. On an urban lot with no yard, the stacking is what produces gardens, light, and air at every level.
The building was also engineered to withstand a magnitude-8 earthquake. That requirement is invisible from the street, but it drove the structural steel, the foundation, and the depth of every cantilever. When I work with clients on hillside lots in Beverly Hills and Bel Air, the same truth holds on a smaller scale: the site decides the structure, and the structure decides how much freedom the interiors get.
The defining interior decision at Antilia is that no two floors share the same plan or the same materials. Each level was designed as its own environment. Lotus and sun motifs carry through the building, repeated in crystal, marble, and mother-of-pearl, but the palette shifts from floor to floor: warm gold and tufted upholstery on one, pale stone and white lacquer on another, dark wood and saturated color on a third.
This is a hospitality approach. A hotel wants each restaurant, lounge, and suite level to feel like a destination. Hirsch Bedner does that brilliantly, and it shows. Every floor at Antilia is memorable on its own.
The cost is coherence. When every level speaks a different language, the house stops reading as one home and starts reading as a collection of venues. That is the tension I would want to resolve. A residence can hold drama, but it needs a through-line the family feels every time they step out of the elevator.
Variety makes each floor memorable. Restraint is what makes a building feel like home. Antilia chose variety.
The terrace gardens are where Antilia gets it most right. Lawns, planting, and domed pavilions sit on the decks the cantilevers create, high above the street, with views across the Mumbai skyline toward the Arabian Sea. On a lot with no ground to spare, the building manufactures its own landscape in the air.
Roof and terrace gardens are among the most demanding things you can build. Every square foot of soil is weight the structure has to carry, and saturated soil is heavier still. You need root barriers, waterproofing membranes layered beneath drainage mats, irrigation, and a way to service it all without crossing the living spaces. In a monsoon climate, the drainage design is not a detail. It is what keeps water out of the ceilings below.
The payoff is enormous. Outdoor rooms at height give every level a connection to light and air, and the plantings soften what would otherwise be a hard, very tall object on a dense street. If there is one idea from Antilia I would bring to a vertical project in Miami or Manhattan, it is this one.
The detail everyone remembers is the snow room: a chilled room where snowflakes fall from the walls, in a city where it is close to 90 degrees for much of the year. It sounds like a novelty. It is actually an early version of something I now see in serious wellness programs everywhere: contrast therapy. Heat in the sauna and steam room, then cold.
Building a cold room inside a home is a mechanical project first. It needs its own refrigeration plant, continuous insulation, a vapor barrier on the warm side of every wall, and drainage for melt. Get the vapor barrier wrong and the cold condenses into the walls of the rooms next door. In Mumbai's humidity, that margin for error is thin.
Antilia pairs the snow room with a spa, a health center, and a pool. This is the same shift I cover in home wellness design: the wellness floor has moved from an amenity tucked in a basement to the center of the brief. Today my clients in Beverly Hills ask for cold plunges and contrast circuits the way they once asked for a home gym.
The family's private quarters occupy the top six floors, the levels with the best light and the longest views. Everything below is built for receiving people. The ballroom is designed for events at a scale most hotels would recognize, with crystal chandeliers and a ceiling height that only a building of this size can give. The 50-seat theater is closer to a small cinema than a media room, and it carries the same acoustic demands I describe in screening room design: isolation first, equipment second.
The rooms that work best are the ones built around a single gesture. A spiral staircase becomes the sculpture in a cream sitting room. A sculptural chandelier fills a double-height living room, with the city behind floor-to-ceiling glass. When a room has one clear idea, the scale reads as generous rather than overwhelming.
The temple is the most personal room in the building, and the most carefully made. Carved marble, shrine niches, and lighting that treats the space as sacred rather than decorative. It is a reminder that the rooms that matter most to a family are rarely the biggest ones. They are the ones that hold their rituals.
Garage: 168 cars across six levels.
Car service floor: A maintenance and service station above the garage (reported).
Ballroom: Crystal chandeliers and an event-scale ceiling.
Theater: 50 seats, closer to a small cinema than a media room.
Snow room: A chilled room where snowflakes fall from the walls.
Spa and health center: With an indoor pool on the wellness floors.
Gym, yoga and dance studios: Part of the wellness program (reported).
Salon: A private hair and beauty salon (reported).
Ice cream parlor: An in-house parlor for the family and guests (reported).
Temple: Carved marble shrine and niches.
Terrace gardens: Lawns and domed pavilions on the cantilevered decks.
Guest floors: Several levels of guest suites (reported).
Family floors: The top six floors, with the best light and views.
Staff quarters: Space for a staff of about 600.
Elevators: Nine high-speed lifts on separate paths.
Helipads: Three on the roof, never certified for use.
The lower part of Antilia is not living space at all. Six levels hold a garage for 168 cars, and reports describe a floor above them given over to car maintenance and service. Nine high-speed elevators move family, guests, and staff on separate paths. Above all of it, three helipads sit on the roof, and they have never been used: they lack approval from India's civil aviation regulator and the defence and environment ministries. At this scale, what gets built and what gets permitted are separate questions.
Then there is the staff. Roughly 600 people run Antilia. That number changes how a house has to be planned. Service corridors, staff elevators, kitchens that can feed a household and a banquet, laundry, storage, and security all need their own circulation, so that the family floors stay quiet. Most of this work is invisible, and that is the point.
I tell clients the same thing at a far smaller scale. In a 12,000-square-foot home in Beverly Hills, the back of house, meaning the service entry, the catering kitchen, the storage, and the mechanical rooms, decides whether the front of house feels calm. Antilia is the extreme version of that rule. The operations plan is the design.
A staff of 600 is not a detail. It is a design requirement, and it shapes every floor the family never sees.
Antilia is guarded like a small military post. In 2013, India's Central Reserve Police Force assigned a 28-member commando team to Mukesh Ambani, the first time the force had given that kind of cover to a private citizen. In 2022 the Ministry of Home Affairs raised it to Z+, the highest category in the country, and reports at the time put the unit at 40 to 50 armed commandos working in shifts. In 2023 India's Supreme Court ordered that the Z+ cover follow the family across India and abroad, with the family paying the full cost.
The house has been tested. In February 2021, an SUV holding 20 gelatin sticks and a threatening letter was found about 400 meters away on Carmichael Road, and it was a security officer at Antilia who alerted the police. In 2017, when a fire broke out on the ninth floor, the house's own staff put it out with the building's fixed firefighting systems before the fire brigade arrived.
That is what security looks like when it is designed in rather than added on. Controlled entry from the street, a carved gate that reads as architecture instead of a checkpoint, guard posts, surveillance, separate circulation for the security team, and fire suppression the building can run on its own. In the homes I design in Beverly Hills and Bel Air, the same thinking applies at a smaller scale. The gate, the sightlines from the street, a safe room, and a back-of-house route for staff and security are drawn into the plan from the first meeting, never bolted on after move-in.
At this level, security is not a system you install. It is a floor plan.
I would keep the structure, the gardens, and the wellness program. Those are the strongest ideas in the building. What I would change is the material strategy. Instead of a new palette on every floor, I would set one language for the whole house, a stone, a wood, a metal, and a small set of colors, and let a few rooms break from it on purpose. The ballroom can be theatrical. The temple can be its own world. The rest of the house should feel like it was written by one hand.
I would also design the exterior with the same care as the interior. Antilia's silhouette is bold, but up close the facade reads as a collection of systems: louvers, framing, and glazing doing different jobs at different levels. A home at this level deserves an exterior material that ages well and reads as permanent, the way limestone does on the best estates. That is the standard I hold in my own design-build practice.
And I would be honest with the client about the helipads. Designing something that may never be permitted is an expensive way to make a statement. The best briefs separate what the family will use every week from what simply sounds impressive.
Antilia was finished in 2010, and it still sets the reference point for what a private home can be. Compare it with the newer generation of billionaire homes, like Zuckerberg's Indian Creek estate or the Beckhams' Miami Beach house, and you can see the market turning. The new homes are quieter. Fewer materials. One designer holding the vision. Wellness at the center rather than on a separate floor.
What has not changed is the lesson underneath Antilia: at the top of the market, a home is an operating system. Structure, mechanical systems, service, security, and privacy decide whether the rooms can do their job. The clients I work with in Beverly Hills, Malibu, Miami, and New York are not building 27 floors. But the questions are the same ones Antilia had to answer, just at a human scale.
Antilia is not just architecture. It is power, stacked vertically. The most useful thing about it is how clearly it shows what to keep and what to leave behind.
Antilia's construction cost is estimated at $1 billion to $2 billion, and it was valued at roughly $4.6 billion in 2023. At around 400,000 square feet, a $2 billion build works out to about $5,000 per square foot, which puts it among the most expensive private residences ever built. The figure covers a 27-floor structure engineered for a magnitude-8 earthquake, nine high-speed elevators, a six-level garage, and interiors where no two floors share the same materials.
Antilia was designed by the Chicago architecture firm Perkins & Will, with interiors by Hirsch Bedner Associates of Los Angeles, a firm known for hospitality interiors including the Mandarin Oriental in New York. Sterling Engineering handled the structure. Leighton Asia began construction and B. E. Billimoria & Company completed it in 2010.
Antilia rises 173 meters (568 feet) over 27 floors on a 1.12-acre plot on Altamount Road in Mumbai. Its floor area is over 400,000 square feet. Because many floors have double or extra-high ceilings, the building stands as tall as a typical 60-story tower. The Ambani family's private living quarters occupy the top six floors.
Antilia includes a 168-car garage across six levels, a 50-seat theater, a ballroom with crystal chandeliers, terrace gardens, a swimming pool, a spa and health center, a temple, a snow room that produces snowflakes from its walls, three rooftop helipads, and nine high-speed elevators. Widely repeated reports also describe a car service floor, a salon, a gym with yoga and dance studios, an ice cream parlor, and guest floors. A staff of roughly 600 people runs the house.
The snow room is a refrigerated room inside Antilia's wellness floors that releases snowflakes from its walls, giving the family a cold environment in a city where daytime temperatures sit near 90 degrees Fahrenheit for much of the year. Rooms like this need their own refrigeration plant, vapor barriers, drainage, and heavy insulation so the cold does not condense into the rooms around it. It sits alongside a spa, pool, and health center as part of the house's wellness program.
Yes. Antilia has three helipads on its roof, but they are not operational. They have never received certification from India's civil aviation regulator or the approvals required from the defence and environment ministries. They are a reminder that at this scale, what gets built and what gets permitted are separate questions.
Mukesh Ambani has Z+ security, the highest protection category in India, provided by the Central Reserve Police Force. The force first assigned him a 28-member commando team in 2013, the first such cover for a private citizen, and the Ministry of Home Affairs upgraded it to Z+ in 2022, when reports put the unit at 40 to 50 commandos working in shifts. In 2023 India's Supreme Court ordered the cover to apply across India and abroad, at the family's expense. At the house itself, security is built into the architecture: controlled entry on Altamount Road, a guarded gate, surveillance, and separate circulation for staff and security.
Antilia was designed as a stack of distinct volumes, each floor with its own plan and material palette, cantilevered around a central core. Lotus and sun motifs repeat through the interiors in crystal, marble, and mother-of-pearl. The stacked form lets terrace gardens and outdoor rooms sit between floors, which is how the building brings green space onto a 1.12-acre urban lot.
Antilia is on Altamount Road in the Cumballa Hill neighborhood of South Mumbai, a street often called Mumbai's Billionaires' Row. The house is named after Antillia, a mythical island from Atlantic legend. The Ambani family moved in during 2011.
The most useful lesson from Antilia is that a home this complex is really an operations plan with rooms attached. The garage, service floors, staff circulation, and mechanical systems take up a large share of the building, and they are what allow the family floors to feel calm. The second lesson is the cost of variety. Giving every floor its own material palette makes each level memorable, but it also makes the house harder to read as one home. In my own design-build practice, I would hold a tighter material language and let a few rooms carry the drama.