Property Management Fees

[Chris Archer]

I have found most management companies take 10% rent plus one half to one full months rent amount when filling a unit.  Considering a 12 unit with $1,000/month rent per unit.  Worst case scenario all tenants could leave after 1 year and once property management re-fills all units, there would be a charge of $12,000??  Or each time a unit is filled property management takes $500-$1,000?  If this is the correct, where do all of you investors account for this charge when running your numbers?  Thank you.