Quick rental investment question - New investor

[Jonathan Pockets]

In my area, after putting 20% down, I will have zero cash flow.

My question:

The goal of a rental property is to put 20% down and have the mortgage paid off by tenants after 30 years.

After that, I can sell or just have positive cash flow for retirement.

Is this correct?

Just wanted to make sure I was clear on the objective.

Thanks!