Hello I am wondering what day after the due date can you start charging late fees?

This lacks the recent law changes regarding reimbursement for legal fees to the tenant.  

Read up and maybe go for a finder's fee on this one.

Besides the inspection and attorney fees.

The brokerages don't care as long as your monthly fees are paid.

One thing to keep in mind if you hire a PM is they may charge you for every lease signed,  so if they rent to a group - that's one charge, if they rent to 4 separate students - that is 4 leases and 4 charges, see if you can negotiate that  - could cost you $300 for group and $1200 individual if you don't negotiate that fee with them.

All I needed was the applicant's email address to send the application to and to pay the fee.2.Very fast turnaroundCompared to the typical paper process the turnaround time was very fast.

From my understanding real estate in big markets such as Chicago, Miami, LA, and NY is very difficult to make profit on because of taxes and other fees.

I check it with different zip code, the fees are different. 

In my area HOA fees run about $125-$175 a month which would cut into your cash flow significantly.