What is the minimum CAP rate to consider for a good investment(single family, duplex (2-)4 units?

Cap rate (NOI/Price) isn't a meaningful metric for you here: You instead want cash-on-cash return (Cash_Flow/All-In_Investment), which tells you the rate of cash returned on your invested cash.

(Especially over the last few years) Is there a catch though to the popularity I'm seeing in Columbus and investing in rentals there? 

I live in Los Angeles so will be investing long distance. 

Good Morning,I live in New York, I am looking to move out of state. I have maybe 3 or 4 states in mind, I am trying to see where I could move that would be the most cost efficient for me. I would like to maybe buy lan...

I'm currently looking at investing in both provinces. 

I'd love some input on what to do:I am a 40 yrs with a stock market investments of 350K trying to coast fire in the next couple of years.I just got a green card and moving to the US from Canada and looking at which accounts to invest that money in the US.But I am not sure I will stay in the US in 10 or 20 yrs.What do you think would be the best strategy to coast fire when you are not sure where you are going to be in your later years?

20 years investing in Tampa. 

I reached out to a second lender that has more agreeable investment lending products and I think we are going to avoid putting it in my personal altogether. 

Credit score- the higher the best. 760-780+ generally gets best pricing for investment property loans with most lenders.