New Lease or Extension with 2 rent amounts? Chicago

[Will Mejia]

In Chicago you have to provide 4 months notice to raise rent. My leases with tentants expires in 2 months and I just gave them 4 months notice that I will raise the rent. I want to know what you guys think is a better option:
1) In 2 months when the lease expires let it turn "month-to-month" status and then 2 months later start New Lease with New Rent from scratch.
2) Write an Extension Amendum now for another year but specifying the first 2 extended months have same rent as before and New Rent will take effect after. So essentially the extention will have the same rent as now but will change to new rent after 2 months.

Thoughts?