Also do you need a formal eviction process to get rid of a roommate? 

If your brother is going to be living in it, make sure you don't skip him signing a formal tenant lease that clearly spells out the expectations and consequences.

It will cost you money to run. you will need to follow appropriate formalities so it does not get "Pierced.

Rules of thumb are great for narrowing down properties quickly but you really need to formally run the numbers on any property your considering. 

I only learned of this when the management company forwarded me an email from the tenants, in which the tenants said they filed a formal complaint with the city.

A SFH with a "mother-in-law" suite is somewhat common (those are more formally called "Accessory Dwelling Units" or ADUs) but the trick to making it successful is buying OFF MARKET.  

They are ok to go through formal eviction process 

----------------You've got to be formal, you've got to be classy, you've got to be personal, you have to think hard about how what you say could be taken by someone who is demonstrate that you know something about the property to express significant interest, you've got to mention in this market that you're not going to ridiculously low-ball the owner (even though, well, of course you'll try), you've got to mention that you can close quickly.

I would like to complete this as efficient and effective as possible so please critique all the flaws in my plan.Find responsive realtor to assist with possible counter offer (I’ve learned I don’t enjoy the lack of formality with a dual agent.)If offer is accepted, create LLCContact firm to structure lease agreement which goes into effect, if and when I become the owner.Agree on terms and sign document with business owner (Aiming for 3-5 year lease or term equal to investor loan.)Armed with agreement, finish discussing financing process with local bank.Investor pitchLocate temporary storage for business if needed.Complete loan processClosing, etc.Other Details:Offer on property 150kAprx lease amount: 3kInitial offer made 32hrs ago through seller agent Cons:Not in the town in which I live.In slight distress.Finding a responsive realtor around here is like pulling teeth!

Most opportunity zones are designated either by zip code or formal neighborhood district boarders.