To take on an existing mortgage loan when buying a property.
When you assume a mortgage loan, you accept the responsibility for repaying the remaining principal of the loan according to the existing terms.
The mortgage loan must be an assumable mortgage loan.
To take on a tenant and an existing lease when buying a property.
When buying a property with a leased apartment, you are obligated to accept the existing lease terms unless the tenant chooses to negotiate new terms with you.