The Regency Hyatt House, Peachtree Center's first first luxury hotel, was officially dedicated in May 1967. Its revolving Polaris Restaurant, sitting atop the structure, provided stunning birds-eye views of the surrounding city.
Photo from Wikipedia / Conner Carey

The hotel's 22-story Atrium Lobby was the first such structure in the world. At the time of its completion, the Regency Hyatt House was said to "usher in the space age" in Atlanta. The name of the hotel was changed to Hyatt Regency in February 1972.
Photo from Wikipedia / Stan Satin

By 1968, a great deal has been added to what existed just 3 years before! There was now the 800-room Regency Hyatt House and 27-story Gas Light Tower, which was the first new structure built on the Peachtree Center core block.