Refinance Rental Property Advice

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Hello,

I would like to refinance one of my rental house and was wondering what the banks typically look for? I assume it is different then refinancing your primary residence. It originally was my primary home but moved out and been renting it for about three years. I used a low down FHA type loan. I am about 80% loan to value. I don't want to lose any time off of my amortization table. Is there a term used to indicate you want to keep the same remaining number of payments? Thanks for reading!