Try this, a building has 10,000 square feet (sf) of space and the rent is $20 per square foot (psf) What is the PGI? \begin{tabular}{ll} \hline & (10,000$20) \\ & (.25PGI) \\ & (PGIVCL) \\ (EGIOE) \end{tabular} \begin{tabular}{|l|c|} \hline PGI & $200,000 \\ \hline VCL & ($50,000) \\ \hline EGI & $150,000 \\ \hline OE & ($60,000) \\ \hline NOI & $90,000 \\ \hline & \end{tabular} When income is discussed in real estate, it typically Net Operating Income