Interest Rates & Closing Costs

[Adonis Yancey]

So I'm reading through Brandon Turner's book on rental property investing and a few questions came to mind. How do lenders determine interest rates? Is it possible to know what sort of interests rate I'll be able to get before purchasing a property? Is the interest rate based on the amount of the loan? Would it be possible to find out the amount for closing cost for when I'm doing my analysis on the property?