Cathays Lord Windsor) on 12 November 1766, he inherited great further lands including in Cathays to the north of his existing estate which he had partially had developed. He then bought other properties and farms, to the north and east, including what became Cathays Park. There he built Cathays House at a cost of £40,000 and at further cost landscaped Cathays Park. After his son took over the title he preferred to live in Cardiff Castle so demolished the house in 1815, and turned Cathays Park into purely enclosed parkland used for grazing. Following the 2nd Marquis' development of Cardiff Docks,
Fairwater, Double Bay can continue to live-in at "Fairwater". "Fairwater" is set on facing Sydney Harbour and in 2017 had an estimated value of approximately 100 million. The retaining walls are of rubble construction with no mortar in the bedding joints. The stone is sandstone, probably local. The front (carriage) drive is surfaced in asphalt with brick edging. The brick edging is contemporary with the retaining walls. The grounds could not be considered particularly interesting examples of a formal garden style. It does however retain a large area, with extensive lawns towards the harbour and a number of mature and fine specimens of