Police were called by the Ambulance Service after the man in his forties was discovered at a business premises on Balderstone Close, Burnley with significant head injuries.
A post mortem examination is due to take place to establish the cause of death. His family are in the process of being told, however formal identification is yet to take place.
Det Supt Paul Withers of the Force Major Investigation Team (FMIT) said: “We are in the early stages of our inquiries and are working to establish exactly how this man has come about these injuries.
“If you have any information about this man’s death, please get in contact with us at your earliest opportunity.”
Anyone with any information is asked to call us on 101 quoting log 182 of July 27th.
Alternatively they can contact Crimestoppers anonymously on 0800 555 111 or online at Crimestoppers-uk.org.