Hot property: Security

The Bradbury Estate, Bradbury, California, US, $78.8m

Where In the San Gabriel Valley in Los Angeles county, on a promontory overlooking the ocean, 30 minutes’ drive from Bob Hope international airport.

What A sprawling compound set in eight acres. The main house has seven bedrooms, 10 bathrooms and 30,000 sq ft of living space. The separate guest house, staff quarters and 10-car garage comprise a further of 6,700 sq ft, while the pool house is 5,700 sq ft. The pool house has an underground 25-yard shooting range, gun room and two large safes.

Why The Bradbury Estate is in a secure gated community with a 24-hour guard and CCTV cameras at its entrance.

Who Hurwitz James Company, www.hurwitzjamesco.com, tel: + 1 310 477 8865

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Villa, Quinta Verde, the Algarve, Portugal, €2.95m

Where Near the Vale do Lobo resort, just south of Almancil, three miles from the coast and 20 minutes’ drive from Faro international airport.

What A four-bedroom villa on a 1,277 sq metre plot. The property is designed for open-plan living and has a roof terrace, gym, spa and cinema room.

Why The Quinta Verde development has only one entrance, which is also the headquarters of security company IBC. This villa has the full security package of infrared and CCTV cameras, with 24-hour emergency response.

Who Savills, www.savills.com/international, tel: +44 20 7016 3740

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South End, Kensington, London, UK, £15.95m

Where In central London, five minutes’ walk from Kensington High Street and 18 miles from Heathrow airport.

What A newly developed, seven-floor terraced house with 6,534 sq ft of living space, five bedrooms and a lift. Three floors are below ground, with a 12m x 4m pool (which converts into a dance floor), wet bar, sauna, gym and 3D cinema lounge.

Why Security measures include: two CCTV systems; two panic rooms with telephone and air supply; a walk-in vault; a 24-gun safe; bulletproof front doors and shatterproof windows.

Who Knight Frank, www.knightfrank.com, tel: +44 20 7938 4311

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Sierra Blanca Mansion, Marbella, Spain, €10m

Where On the Costa del Sol, five minutes’ drive from the beaches of Marbella and 50km from Malaga international airport.

What A seven-bedroom, 1,706 sq metre house with a 6,093 sq metres of grounds. Recently reduced from €12m, the mansion has its own alarm system with infrared cameras connected to the central security office.

Why The gated Sierra Blanca Estate is monitored 24 hours a day by security guards. From 8pm only residents with a remote control can enter or leave the estate.

Who Engel & Völkers, www.engelvoelkers.com, tel: +34 952 868406

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Vandoeuvres, Geneva, Switzerland, SFr19.9m (£13.1m)

Where On the left bank of Lake Geneva, 10 minutes’ drive from the city centre and seven miles from Geneva international airport.

What A five-bedroom, five-bathroom house built in 2010 on a plot of 2,000 sq m, with two reception rooms, an entertainment room and a hammam sauna.

Why As well as two large safes, this property has a nuclear bunker, a legal requirement in Switzerland. This bunker has its own air supply and storage for three months’ supply of food.

Who Chesterton Humberts International, www.chestertonhumberts.com, tel: +44 20 3040 8210