Oil heat paid by owner is it possible to convert to subme treed and paid by tenants

[Ben Bard]

I am looking at a triplex which looks decent and is priced well...except It uses oil for heat, that paid by the landlord. The bill for oil is ~7k per year which destroys the cashflow Has anyone successfully converted a system like this to sub metered and paid by tenants? Any ideas on how this could this be done, and what would it cost?