This document discusses key real estate metrics used to evaluate investment performance and risk. It defines metrics like yield on cost (YOC), return on cost (ROC), internal rate of return (IRR), equity multiple (EM), gross rent multiplier (GRM), cash on cash return, debt service coverage ratio (DSCR), debt yield, loan-to-value (LTV), and capitalization rate (cap rate). Examples are provided to illustrate how to calculate some of these metrics. The document also notes some limitations of using cap rates to compare properties with different risk profiles.