I'm purchasing my first student rental property. The property is a triplex with 2 units having 4 bedrooms and 1 unit has 5 bedrooms. I know that the best practice is to have all students on one lease. I'd like to have one person co-sign for each unit, but am unsure how common this is and what the best practice may be? I'd expect parents to be hesitant co-signing for the rent of a 4-5 bedroom unit. I'm interested to know what others do.