A crime scene has been established in Adelaide's CBD after a man's body was found inside his home yesterday evening.

South Australia Police said they are treating the death as suspicious after officers were called to the unit block on Sturt Street at about 6.30pm.

Detectives from Eastern District CIB and Major Crime Investigation Branch, along with Forensic Crime Scene examiners attended the scene.

Investigations are continuing.

Police have urged anyone with information to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au/.