Hyatt Regency Wai­kiki Beach Resort and Spa has completed a $100 million renovation of the beachfront resort’s 1,230 rooms, including Japa­nese bidet-style toilets with cleansing jet streams in each room.

The investment by Blackstone Group LP, which bought the leasehold on the property for $450 million in 2013, is expected to complete the transformation of the nearly 40-year-old property.

When the Hyatt Regency Wai­kiki was built in 1976 for $100 million by celebrated developer Christopher Hemmeter, it launched the concept of the opulent mega-resort in Hawaii.

The new renovations will establish a more cas­ual atmosphere that appeals to the resort’s thriving Asian market and a younger generation of visitors.

"We are extremely excited to have completed our guest room remodel and stepping into a new era for our property," said Hyatt Regency Wai­kiki General Manager David Nadelman. "Our bathrooms are modern, and we have been able to utilize the size of our large rooms to include 55-inch televisions in each room."

All of the rooms include Hyatt’s celebrated pillow-topped Grand Bed and Washlets, the toilets made by Japa­nese-based Toto Ltd. that typically offer everything from seat-warming and cleansing jet streams to deodorization and even air-drying. Room colors reflect the sea, and contemporary furniture will offer subtle Hawaii-style details. For example, the end of each room’s desk is shaped like a surfboard, and there are koa wood clocks on each wall. Rooms also include more storage area, hanging hooks and outlet pods.

These latest renovations came on the heels of a 2009 suite renovation, a $13 million third-floor renovation in 2011 — which included three restaurants, the Jacuzzi, Regency club and lounge areas — and the just-completed $2.5 million renovation of the Koa Ballroom.