Or he pays you less (or maybe nothing) and builds you a house on your smaller lot.How sure are you that this lot is able to be divided as you plan? 

You could still do that if the money you invest by taking cash out generates higher returns than you are paying.2.

If you are paying cash, then interest rates will not be an issue. 

These loans often have interest-only payment options, meaning you only pay the interest for the duration of the loan or a shorter period based on the market conditions.

If they don't, the landlord is next in line to be sued.If you require renters insurance the insurance companies can fight about who pays if something bad happens. 

And then you lose all your bene's and raising a family and paying for health insurance is a big deal. 

API connected, if you only have Airbnb guests for a month and Airbnb supposedly paying the state taxes, when you submit your monthly State tax form, do you enter ZERO in the transient rental box?

If you opt for a DSCR loan and choose to escrow the repair funds, you'll only pay interest on the amount as you use it.

When it comes to contractors, or any service for that matter, it pays to remember the following:There are three kinds of service--you can pick any two:GOOD - CHEAP - FAST1. 

Their pricing decision will be influenced by all kinds of crazy things and in this market, is higher than what you can pay as an investor.