Property Management Cost for 4-unit in A class neighborhood?

[Adam Juodis]

Trying to squeeze the numbers out on a 4-unit in a Class A area. Approximately how much % of rent would you estimate for property management?

Since this is in a Class A area and the rent is higher, is it fair to assume % off rent? The neighborhood next door could rent for $250 a door less, so would managers in a great area charge less than management for a area of lesser quality?

Also, the fact that it is a 4-unit, shouldn't there be a discount since all 4 doors are under the same roof (For convenience reasons)?