A Safer Office Investment with GRR & GBB – ODOM Tower About the project:  Upon completion in 2028: Payment plan: How does GRR and GBB work, the example – the value of the commercial property is $369,449: GRR (Guaranteed Rental Return) Formula: Total Cost x GRR (8%) x Period (5 years). Period: Total ROI: 40% … Continue reading ODOM Tower: Calculating the profitability of commercial real estate in the project