Property Management Fee Negotiation as Portfolio Increases

[Keith A.]

I have been using the same property management company now for about 4 years and have an 8% management fee on rents and there is also a lease renewal fee of 50% of one months rent.  The lease renewal fee after researching some seems excessive.  I am close to 30 units that consist of SFHs and small 2-4 unit MFHs.  I wanted to get some advice on the rate and this renewal fee based on an increasing portfolio size.  I have no complaints other than wanting to pay fair rates based on the portfolio size.  Any input is appreciated.