... reduction)COMMERCIAL REAL ESTATE INVESTING40 New net operating income (NOI) $ 64,600Annual cost of debt $ 41,244 (principal and interest of the new $515,555 mortgage) New cash flow $ 23,356Capital invested ... provide for annual in- creases in rent. Some leases are tied to a cost of living index, or some other outsidebenchmark index. In these instances, any increase in that index will cause the rent to ... factors are and how they can cause the value to move either up or down.The key to success in real estate is to use this knowledge in determining when and what to buy, and how to maximize your...