Need help understanding real Average Rent and Total Gross Monthly

[Omosalewa Aderonmu]

BP Family!

Please, I need help understanding the different between real average rent for a 3 bedroom property and intended monthly rent in regard to a student housing rental. 

For example: do you calculate the total gross monthly rent for each room separately in 3 bedroom property intended for student rental.

3 bedroom with firm purchase price.

Average rent of property: $1050

Intended owner rent per room for student housing: $500 each = $1500 now average rent.

Do you calculate the rental property per $1050 or the $1500. Because, if average rent of the property is $1050, I don't understand why you'd want to short yourself. Because, if you don't eventually utilize the property for student rental, then it'll be a bad deal if you made the purchase on a firm selling price.

Thank you.

~Steazy