A fourth challenge of using DCF analysis for CRE projects is comparing alternative options. CRE projects often involve multiple options or decisions, such as whether to buy, sell, hold, lease, or develop a property, or whether to invest in one project or another. Comparing alternative options using DCF analysis can be challenging because they may have different cash flow profiles, discount rates, risks, and objectives. Moreover, they may have different impacts on the overall portfolio and strategy of the corporation. Therefore, it is important to use consistent and comparable criteria and metrics when comparing alternative options using DCF analysis. Some common metrics used for comparing alternative options are net present value (NPV), internal rate of return (IRR), profitability index (PI), and payback period. However, these metrics may have limitations and drawbacks, such as ignoring the time value of money, being sensitive to cash flow timing, or being biased by scale or size. Therefore, it is important to use multiple metrics and qualitative factors when comparing alternative options using DCF analysis.