Police were called to Young's residence shortly after 5 p.m. local time on Monday after receiving reports of a man falling out of a fourth floor window.
Young, 52, had been involved in a public divorce from his wife Michelle that resulted in a £20 million settlement in her favor. In the divorce proceedings, Young argued that he was penniless and was more than £28 million in debt, while his wife maintained that he was worth billions.
Young and Reno recently appeared on Bravo's Ladies of London together.
Police are not treating Young's death as suspicious.