@ Jen
Thanks for your question. We (in this neck of the woods) call "On-Sites" the usual Husband/Wife team who manage the property, aka "The Managers". Normally, the wife runs the office, leases and moves out folk, and in the case of a Tax Credit Property, does the recertifications. The wife normally holds the title of "manager", while the husband holds the title of "caretaker".
What is difficult to do, is to locate people to perform these jobs. IE: You don't have much luck getting a person who has only worked at Sonic to do Recertification paperwork on Tax Credit, unless you either train her (assuming she is clerically skilled to begin with) or send her off to a school. Both are done. On the caretaker, you can usually find someone who knows how to mow. If you have to teach someone to mow grass, you have an immediate problem anyway. So take someone who can mow grass and graduate them to doing commercial landscaping work, it is not that difficult. It gets harder to find someone in the caretaker field who can figure out what is leaking, or not switching on, or not cooling, or the washing machine won't spin. We hire folks under the title of "light" maintenance, and if they are a skilled handyman, all the better, for us, and for their own paycheck. So hiring "On-Sites" can be the luck of the draw, but amazingly, we have some long term, excellent people on the payroll as managers. They are, however, same as good tenants, becoming harder and harder to find.
We don't really have the management hiarchy of the large zillion unit property management agencies, but we have a lot of properties in the less than 100 unit arena.
The On-Sites get a salary, free apartment, free utilities, salary for the office, salary for the grounds, and usually minimum wage for other work. (I don't agree with maintenance type work at MW, but it is that way.) They also have the authority after a period of employment, to contract out work they are unable to do.
The On-Site managers are the backbone of the property management company, and the actual success fixtures of the business. In the corporate office, you have a couple of floors full of desks, and people who stare into computers, and dress in "business casual". These, of course, are the people who post the rents and deal with all the cough and jerk stuff from USDA-Rural Development, HUD, The banks, the finance companies, the government, etc, etc. Then on another level are the managing agents. Each managing agent will have up to around 15 properties. Then you have the VP's and finally the president of the company.
The managing agents have the responsibility to either hire On-Sites, send someone else from another property to run the property, or run the property his/herself (Good luck on the latter!) The corporate office is well overstaffed, but this is necessary. There is always a "new" thing coming around, or compliance issue, or just another letter to write proving we do/did or will, in the future, do better.
All these corporate employees should first receive baptism as an On-Site, and a lot of them have. Some have not. Another job of the corporate is to send out some nasty grams to the On-Sites chiding them for late rents, vacancies, and when the next Staff Infection (oops I mean "Inspection") will be held. Also we need a few desks down there to quote "book, chapter, and verse" when someone drags a foot over the "Fair Housing Laws" or the "Americans with Disabilities Act".
So, Jen you got more than you wanted on my answer, and your probably sound asleep by now, that is the view from my window!!
Cheers.