Why do you want to buy 2 rentals a year?

They suggest, you buy and place. 

I don't buy from wholesalers, so I never had to ask anyone any questions, but if I WERE to buy from a wholesaler (eewww, do you know who you are talking to?

Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

Hi Everyone, My name is Moustafa and since my wife and I just got married we are looking more into our future to be FI.

The key is that in order to completely defer all tax you must purchase at least as much as your net sale. 

It can take a year or more to complete an ADU.

Best of luck with selecting your market—there's a wealth of knowledge and supportive investors here to help guide you along the way.

You could force the seller to bring it up to code before the sale is complete as one of the contingencies of buying it, let them deal with it.

BiggerPockets is a great place to find featured agents experienced with long-term rental investments—they can guide you to cash-flowing properties and connect you with resources like contractors and property managers.