Sir Donough O'Brien, 1st Baronet, died in 1717. During his time at Dromoland, it was described as "a handsome Grecian Building." Donough's son Lucius also died in 1717 so Edward, son of Lucius, became 2nd Baronet. This first Sir Edward O'Brien decorated the house with pictures and carvings. He also had designs drawn up for a new house. Thomas Roberts and John Aheron both submitted drawings to him for a house and garden at Dromoland. John Aheron appears to have been the architect responsible for the final design. He also designed the Gazebo on Turret Hill, across the road from the main entrance gateway. It was probably built for observing the training of horses. Dromoland was expanded to a ten-bay, -storey house. A two-story quadrangle was completed in 1736. Edward died in 1765.