All of the expenses related to a refinance of a rental property can be amortized. This includes appraisal fees, application or credit report fees, points or loan origination/assumption fees, and more. These expense are not deducted 100% in the year of the refinance. Instead, they are amortized (i.e. spread-out) over the life of the loan.
Keep in mind that there are other expenses that are deductible on a rental property that aren't deductible on a primary residence. See our article, "What is deductible when I own a rental property?"