Elmhurst was the principal owner of ADS Security, headquartered in Nashville, Tennessee. ADS Security, L.P. was the 23rd largest electronic security alarm firm in the nation, according to Security Distributing & Marketing (SDM), a leading industry publication. Elmhurst sold ADS to Vector Security in 2019.
In 2004 Elmhurst invested in Pittsburgh-based Prospera Hospitality. Prospera offers expertise in management, re-positioning, acquisitions and development of limited and full-service independent and branded hotels and resorts.