PM vs Site Manager

[Jennifer Johnson]

Hi Everyone,

 For a while now, I thought that property management company (PM) and site manager are the same.  But after reading numerous posts and threads, I'm not so sure anymore.  

Please correct or clarify.

I could hire a PM company that charges 10% of gross revenues, for instance, and they will take care of the property.  If its a small property like less than 20 units, then they could manage from their own office/headquarter.  If its a larger property like more than 40 units, then they will send a site manager or resident manager??? Will I be paying additional for the site manager or resident manager or is that fee included in the total 10% that they are charging already?  

I'm hoping from these questions, you'd be able to explain or correct me if I'm way off base. Thank you in advance.

Jen