Who renews commercial leases? Property Mgr or Leasing Broker?

[James W.]

I have a commercial retail building with 12 tenants currently. A few of the leases have expired and are now on month-to-month. I am using Cushman Wakefield as my broker.

My property mgr says they can renew my leases for free versus Cushman Wakefield will charge 6% of the term of the lease for renewals.

Do most landlords use their property mgr to renew leases or the leasing broker? Should I be using the leasing broker to renew the leases just to keep a good relationship with her?