I would only buy an occupied property if: 1-tenant lease was executed legally with valid rental license, rental suitability cert, written lease etc. 2-tenant is in good standing, payments up to date, preferably paying with bill pay/Venmo/cash app; get proof of payments 3-property in good condition. 

No increase will cover that.Add to that the very real possibility that he may feel eviction proof  if he is buying a home.1 year lease. 1 1/2 months security deposit and if he buys a house you have something to attach a lein  to!

The owner of the property needs to provide you with proof of property insurance to include a general liability policy.Hiring/Managing/Paying Contractors. 

I'm looking for Proof Of Funds.

The original side i was living in for the first 2 years is now being rented to someone.What's the proof we have to give when we're owner occupying just 50% or some other portion

They'll want proof of funds (POF) and a contract in place with a short option period. 

But it worked and I had proof of concept and nothing could have been more important to me at the time! 

https://www.amazon.com/Rejection-Proof-Became-Invi...Although it is not real estate related per se, it is a book I greatly enjoyed and I would highly recommend to others.

I would absolutely need some sound proofing.

Before you know it you will have a track record and "proof of concept".