We plan to target: Absentee Landlord, NoD (Notice of Default), Building Code Violations and Tax Delinquencies. 

The seller says the house has 4 bedrooms but the 4th is an addition done by an owner so I'm guessing it is not professional and to be safe I'm going to assume it doesn't meet code and is just another room (or closet).

I purchased a list of 2-300 Units in 1 zip code and quickly found that the data isn't as accurate as I was expecting.

I can control it from my phone from San Francisco (my property is about 500 miles away from me) and it integrates with Airbnb to send guests automatic personalized codes for their reservation that expire after the end of their stay.

Can anyone tell me that what are the code requirements to consider a bedroom in the Basement as Legal Bedroom?

I can got you a discount code if you want to try it.In the end, from a liability standpoint, it may be best not to try and estimate the repairs.

Wiring has codes and unlikely you have the training. 

I'm taking a different approach getting into real estate investing because I am also a city planner, and know zoning codes very well.

This is the 19103 zip code, which is also where I work.  

But here's the code from Regulation Z, for the one sale per year exemption.