Like you said, mortgage rates are between 3.5-4.75% for residential loans on 30 year mortgages, when you then factor in an expected average inflation rate of about 2% and the fact that you can deduct interest that's practically free money.

The only problem with an app is that construction cost vary so much based on different factors.

I suspect that other factors in your financial profile will play into the answer.  

Some local investors tell me no less than 8% vacancy factor and cap ex depends on current conditions of the property and what will need to be done within the next 3 years, could be 10% of gross rents.

If you plan to invest out of state, remember to factor in management costs.

I don't see that you factored anything for that either.

Obvously other factors play in and the property is a big variable.  

What economic factors must be present to carry on business in our economy, land or Fords?

No treatment is working so far, and the doctor adviced them to see if there was any mold in the home.

This is also with me factoring in 11% for property management, however, I plan on managing this one myself.