You're absolutely right—positive cash flow from rentals can vary significantly depending on factors like property costs, financing, and the ever changing market conditions.For real estate the challenge isn't just accumulating properties but creating a framework that builds net worth more strategically and sustainably.Cash Flow can be generated in many ways, my intention was to better understand the investor mindset and their approach, if they wanted to share.Based on your example, if using conservative calculations at $100K/door, you would pay $20M for access to $40K/month. 

I have a calculator that I use and can demo it.

@Kevin Wood: Fixed Asset Management module is included in the QuickBooks Accountant version where you can calculate the depreciation.

Karl's Mortgage Calculator - This is a downloadable app for your phone. 

Some banks and lenders will calculate your Heloc payment based on the Max limit even if you only have a small portion used due to preventive risk. 

They calculate a "net effective" rent that's more appealing to the tenant, basically amortizing the concession over the lifetime of the lease.

After she gave me the numbers, I calculated the rehab to be around $16,000 which I was fine with.I saw on the app we use to track expenses that there were small charges for the rehab which I was fine with.

You'll just have to figure out how much utilities normally are for your calculations. 

A brand new calculator is just that, a calculator.

I was wondering if anyone had any recommendations on how to calculate a relatively accurate 5 year rent growth for a market?