It depends, really. My first apartment was in a three unit building managed by a small management company. We mailed checks. My next apartment was a condo we r

It depends, really. My first apartment was in a three unit building managed by a small management company. We mailed checks. My next apartment was a condo we rented directly from the owners. We paid by bank transfer. Then the third place I rented years later after moving across country was managed by a large management firm and they had an online portal with rental payment, maintenance tickets, and all that. We weren't in large building, it was a townhouse, but they had properties all over the region they managed.