It is not unreasonable to charge a fee for that time.  

Here is where the unreasonable expectations come in.  

I'm no lawyer, it just feels like a landlord could purposefully abuse this by "forgetting" about the documents, and then forcing an eviction by giving an unreasonable compliance time. 

I don't know the size or niceness of the units, but I don't think the list price sounds unreasonable for the location and 3 units.Also there is no way you should be spending 50% of the rents on operating costs at this price point.

I honestly don't see that being unreasonable.

. $500 for the unit would be on the higher side, but still would not be unreasonable for the unit.

If this is common practice, would it be unreasonable to ask them to pay some or all of the premium?

As far as the posts stating someone is somehow cheap by expecting a reasonable rate for the service being rendered, good business is knowing when you are spending too much for a service and taking steps to reduce expenses, especially when they are unreasonable. 

If I think your expectations are completely unreasonable for a particular area, I'll let you know.  3.

The management agreement does say 10% or rent or $75 whichever is greater, but I think it's unreasonable.