Starwood Hotels & Resorts Worldwide has opened a 297-bedroom hotel under its St. Regis brand in Shenzhen, China - the fourth St. Regis to open in Asia in the past six months.

Designed by architect Sir Terry Farrell, The St. Regis Shenzhen occupies the top 28 floors of the 100-story Kingkey 100 landmark building.

The hotel features a sprawling Iridium Spa, a collection of restaurants and lounges and will offer the legendary St. Regis Butler Service to all guests.

Located on the 75th floor, the 700sq m (7,500sq ft) Iridium Spa will offer bespoke treatments tailored to guests' needs.

The spa houses eight treatment suites, including two large couples suites and a Vichy Shower suite. Just adjacent to the spa, a 28-meter indoor infinity pool "spills out" over the city with floor-to-ceiling windows and a tranquil ambience.

Guests will be asked to leave their watches and communication devices in a secure vessel upon arrival before being escorted on a spa journey that will be marketed as "bestowing the rarest luxury of all: Time".

Qian Jin, senior vice president of operations, said: "Opening The St Regis Shenzhen atop the city's tallest building is perfect way to introduce the iconic St. Regis brand to one of China's most modern cities.

"As Shenzhen continues to emerge as an international destination, discerning travelers and the city's social set will welcome the bespoke service and beyond expectation experiences that only St. Regis can offer."