If I understand the question, you are asking when is it profitable to have an on-site property manager. If so, I don't believe you can base it on # of units, alone without taking into consideration the overall net from operations (NOI). In order to have an on-site manager it would need to cash flow to meet your intended expectations. With that being said, there are many property management companies available that can service your investment properties without being on-site very effectively and much more cost effectively to you.
Apr 20, 2010