How are investors paid back?

[Achi Adamit]

In the beginning stages of raising funds for a student housing development project, but am curious to know what are the different methods investors are paid. For instance, do they get paid at the end of the investment period in one lump sum plus interest? Or do they get paid on a monthly basis plus interest? 

Granted, there isn't much info here but would love to hear your guys' thoughts.