The current rents can support 2800 gross per month for all 4 units.

I am getting no support.

Meaning if closing costs are only 2% and you have a surplus of 4%, that extra concession can not be put toward the down payment. 

A fellow investor or someone else with some extra capital that they are looking to grow at a solid rate?

Would you be able to earn more money through other investments with the extra money you'd have to spend on a mother in law unit?

Yes, there are investor-oriented real estate brokerages that assist clients with the pre-acquisition analysis and support services you seek.If Metro Atlanta is one of your target markets, I'd be happy to refer you to the same brokerage I refer my own international clients to.

You should not go with emotion and buy something that you might not able to support it and always have a backup plan.

Hey I see...so I'm trying to get my assessed property tax lower because the bank loaned extra for the property because we put a lot for a downpayment on a 1031 exchangeWhat's the best way to minimize my property taxes?

However, you can actually defer the gain realized (If any, there might not be any gain sometimes even if you have extra cash after payoff) on the rental portion with the section 1033 know as an involuntary conversion since the property was a total loss. 

Would it be smarter to just use the $150 extra a month on a different form of advertising ?